265280891 has 2 divisors, whose sum is σ = 265280892. Its totient is φ = 265280890.

The previous prime is 265280881. The next prime is 265280923. The reversal of 265280891 is 198082562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265280891 - 2²² = 261086587 is a prime.

It is a super-2 number, since 2×265280891² = 140747902259507762, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (265280881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132640445 + 132640446.

It is an arithmetic number, because the mean of its divisors is an integer number (132640446).

Almost surely, 2^265280891 is an apocalyptic number.

265280891 is a deficient number, since it is larger than the sum of its proper divisors (1).

265280891 is an equidigital number, since it uses as much as digits as its factorization.

265280891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 265280891 is about 16287.4458095798. The cubic root of 265280891 is about 642.5426930404.

The spelling of 265280891 in words is "two hundred sixty-five million, two hundred eighty thousand, eight hundred ninety-one".