265990791 has 24 divisors (see below), whose sum is σ = 406788480. Its totient is φ = 154192720.

The previous prime is 265990771. The next prime is 265990793. The reversal of 265990791 is 197099562.

It is not a de Polignac number, because 265990791 - 2⁵ = 265990759 is a prime.

It is a super-2 number, since 2×265990791² = 141502201793611362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 265990791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265990793) 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 23 ways as a sum of consecutive naturals, for example, 7581 + ... + 24278.

It is an arithmetic number, because the mean of its divisors is an integer number (16949520).

Almost surely, 2^265990791 is an apocalyptic number.

265990791 is a deficient number, since it is larger than the sum of its proper divisors (140797689).

265990791 is a wasteful number, since it uses less digits than its factorization.

265990791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31907 (or 31896 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 48.

The square root of 265990791 is about 16309.2241078477. The cubic root of 265990791 is about 643.1153373512.

The spelling of 265990791 in words is "two hundred sixty-five million, nine hundred ninety thousand, seven hundred ninety-one".