265112991 has 24 divisors (see below), whose sum is σ = 449890896. Its totient is φ = 148314240.

The previous prime is 265112989. The next prime is 265112993. The reversal of 265112991 is 199211562.

It is an interprime number because it is at equal distance from previous prime (265112989) and next prime (265112993).

It is not a de Polignac number, because 265112991 - 2¹ = 265112989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265112993) 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 23 ways as a sum of consecutive naturals, for example, 101710 + ... + 104283.

It is an arithmetic number, because the mean of its divisors is an integer number (18745454).

Almost surely, 2^265112991 is an apocalyptic number.

265112991 is a deficient number, since it is larger than the sum of its proper divisors (184777905).

265112991 is a wasteful number, since it uses less digits than its factorization.

265112991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206023 (or 206020 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 265112991 is about 16282.2907172179. The cubic root of 265112991 is about 642.4071063346.

The spelling of 265112991 in words is "two hundred sixty-five million, one hundred twelve thousand, nine hundred ninety-one".