256053515 has 4 divisors (see below), whose sum is σ = 307264224. Its totient is φ = 204842808.

The previous prime is 256053493. The next prime is 256053529. The reversal of 256053515 is 515350652.

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 256053515 - 2¹² = 256049419 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25605347 + ... + 25605356.

It is an arithmetic number, because the mean of its divisors is an integer number (76816056).

Almost surely, 2^256053515 is an apocalyptic number.

256053515 is a deficient number, since it is larger than the sum of its proper divisors (51210709).

256053515 is an equidigital number, since it uses as much as digits as its factorization.

256053515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51210708.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 256053515 is about 16001.6722563612. The cubic root of 256053515 is about 635.0046623751.

The spelling of 256053515 in words is "two hundred fifty-six million, fifty-three thousand, five hundred fifteen".