256131402 has 8 divisors (see below), whose sum is σ = 512262816. Its totient is φ = 85377132.

The previous prime is 256131397. The next prime is 256131413. The reversal of 256131402 is 204131652.

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

256131402 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21344278 + ... + 21344289.

It is an arithmetic number, because the mean of its divisors is an integer number (64032852).

Almost surely, 2^256131402 is an apocalyptic number.

256131402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256131402 is a wasteful number, since it uses less digits than its factorization.

256131402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42688572.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 256131402 is about 16004.1057857039. The cubic root of 256131402 is about 635.0690416178.

The spelling of 256131402 in words is "two hundred fifty-six million, one hundred thirty-one thousand, four hundred two".