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13240261 = 16779283
BaseRepresentation
bin110010100000…
…011111000101
3220220200020001
4302200133011
511342142021
61151441301
7220353226
oct62403705
926820201
1013240261
117523671
124526231
132987698
141a8924d
151268091
hexca07c5

13240261 has 4 divisors (see below), whose sum is σ = 13319712. Its totient is φ = 13160812.

The previous prime is 13240231. The next prime is 13240291. The reversal of 13240261 is 16204231.

It is the 1486-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (13240231) and next prime (13240291).

It is a cyclic number.

It is not a de Polignac number, because 13240261 - 29 = 13239749 is a prime.

It is a super-2 number, since 2×132402612 = 350609022696242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13240231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39475 + ... + 39808.

It is an arithmetic number, because the mean of its divisors is an integer number (3329928).

Almost surely, 213240261 is an apocalyptic number.

It is an amenable number.

13240261 is a deficient number, since it is larger than the sum of its proper divisors (79451).

13240261 is an equidigital number, since it uses as much as digits as its factorization.

13240261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79450.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 13240261 is about 3638.7169441989. The cubic root of 13240261 is about 236.5731842218.

Adding to 13240261 its reverse (16204231), we get a palindrome (29444492).

The spelling of 13240261 in words is "thirteen million, two hundred forty thousand, two hundred sixty-one".

Divisors: 1 167 79283 13240261