261516269 has 4 divisors (see below), whose sum is σ = 298875744. Its totient is φ = 224156796.

The previous prime is 261516223. The next prime is 261516289. The reversal of 261516269 is 962615162.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261516269 is a prime.

It is a super-2 number, since 2×261516269² = 136781517903360722, 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 (261516289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18679727 + ... + 18679740.

It is an arithmetic number, because the mean of its divisors is an integer number (74718936).

Almost surely, 2^261516269 is an apocalyptic number.

It is an amenable number.

261516269 is a deficient number, since it is larger than the sum of its proper divisors (37359475).

261516269 is an equidigital number, since it uses as much as digits as its factorization.

261516269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37359474.

The product of its digits is 38880, while the sum is 38.

The square root of 261516269 is about 16171.4646522818. The cubic root of 261516269 is about 639.4887429010.

The spelling of 261516269 in words is "two hundred sixty-one million, five hundred sixteen thousand, two hundred sixty-nine".