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113081281 = 179631739
BaseRepresentation
bin1101011110101…
…11101111000001
321212210010100121
412233113233001
5212422100111
615115420241
72542114015
oct657275701
9255703317
10113081281
1158916705
1231a54681
131a573a01
1411038545
159dda871
hex6bd7bc1

113081281 has 4 divisors (see below), whose sum is σ = 113713200. Its totient is φ = 112449364.

The previous prime is 113081279. The next prime is 113081303. The reversal of 113081281 is 182180311.

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, and also an emirpimes, since its reverse is a distinct semiprime: 182180311 = 1091671379.

It is a cyclic number.

It is not a de Polignac number, because 113081281 - 21 = 113081279 is a prime.

It is a super-2 number, since 2×1130812812 = 25574752225201922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113081231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315691 + ... + 316048.

It is an arithmetic number, because the mean of its divisors is an integer number (28428300).

Almost surely, 2113081281 is an apocalyptic number.

It is an amenable number.

113081281 is a deficient number, since it is larger than the sum of its proper divisors (631919).

113081281 is an equidigital number, since it uses as much as digits as its factorization.

113081281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631918.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 113081281 is about 10633.9682621306. The cubic root of 113081281 is about 483.5747023797.

The spelling of 113081281 in words is "one hundred thirteen million, eighty-one thousand, two hundred eighty-one".

Divisors: 1 179 631739 113081281