265613531 has 4 divisors (see below), whose sum is σ = 266244864. Its totient is φ = 264982200.

The previous prime is 265613449. The next prime is 265613533. The reversal of 265613531 is 135316562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 265613531 - 2¹⁰ = 265612507 is a prime.

It is a super-2 number, since 2×265613531² = 141101095700575922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265613533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315035 + ... + 315876.

It is an arithmetic number, because the mean of its divisors is an integer number (66561216).

Almost surely, 2^265613531 is an apocalyptic number.

265613531 is a deficient number, since it is larger than the sum of its proper divisors (631333).

265613531 is an equidigital number, since it uses as much as digits as its factorization.

265613531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631332.

The product of its digits is 16200, while the sum is 32.

The square root of 265613531 is about 16297.6541563502. The cubic root of 265613531 is about 642.8111457577.

The spelling of 265613531 in words is "two hundred sixty-five million, six hundred thirteen thousand, five hundred thirty-one".