256131562 has 8 divisors (see below), whose sum is σ = 385410276. Its totient is φ = 127661472.

The previous prime is 256131539. The next prime is 256131569. The reversal of 256131562 is 265131652.

It can be written as a sum of positive squares in 2 ways, for example, as 250557241 + 5574321 = 15829^2 + 2361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (256131569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201363 + ... + 202630.

Almost surely, 2^256131562 is an apocalyptic number.

256131562 is a deficient number, since it is larger than the sum of its proper divisors (129278714).

256131562 is a wasteful number, since it uses less digits than its factorization.

256131562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404312.

The product of its digits is 10800, while the sum is 31.

The square root of 256131562 is about 16004.1107844204. The cubic root of 256131562 is about 635.0691738560.

The spelling of 256131562 in words is "two hundred fifty-six million, one hundred thirty-one thousand, five hundred sixty-two".