265131506 has 4 divisors (see below), whose sum is σ = 397697262. Its totient is φ = 132565752.

The previous prime is 265131497. The next prime is 265131521. The reversal of 265131506 is 605131562.

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

It can be written as a sum of positive squares in only one way, i.e., 227738281 + 37393225 = 15091^2 + 6115^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66282875 + ... + 66282878.

Almost surely, 2^265131506 is an apocalyptic number.

265131506 is a deficient number, since it is larger than the sum of its proper divisors (132565756).

265131506 is a wasteful number, since it uses less digits than its factorization.

265131506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132565755.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 265131506 is about 16282.8592697966. The cubic root of 265131506 is about 642.4220608270.

The spelling of 265131506 in words is "two hundred sixty-five million, one hundred thirty-one thousand, five hundred six".