256515051 has 8 divisors (see below), whose sum is σ = 368329360. Its totient is φ = 157855392.

The previous prime is 256515001. The next prime is 256515073. The reversal of 256515051 is 150515652.

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

It is a de Polignac number, because none of the positive numbers 2^k-256515051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256515001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3288616 + ... + 3288693.

It is an arithmetic number, because the mean of its divisors is an integer number (46041170).

Almost surely, 2^256515051 is an apocalyptic number.

256515051 is a deficient number, since it is larger than the sum of its proper divisors (111814309).

256515051 is a wasteful number, since it uses less digits than its factorization.

256515051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6577325.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 256515051 is about 16016.0872562558. The cubic root of 256515051 is about 635.3859649548.

The spelling of 256515051 in words is "two hundred fifty-six million, five hundred fifteen thousand, fifty-one".