256460515 has 4 divisors (see below), whose sum is σ = 307752624. Its totient is φ = 205168408.

The previous prime is 256460507. The next prime is 256460527. The reversal of 256460515 is 515064652.

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 256460515 - 2³ = 256460507 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, 25646047 + ... + 25646056.

It is an arithmetic number, because the mean of its divisors is an integer number (76938156).

Almost surely, 2^256460515 is an apocalyptic number.

256460515 is a deficient number, since it is larger than the sum of its proper divisors (51292109).

256460515 is an equidigital number, since it uses as much as digits as its factorization.

256460515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51292108.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 256460515 is about 16014.3846275778. The cubic root of 256460515 is about 635.3409333347.

The spelling of 256460515 in words is "two hundred fifty-six million, four hundred sixty thousand, five hundred fifteen".