256532515 has 8 divisors (see below), whose sum is σ = 308454048. Its totient is φ = 204816000.

The previous prime is 256532503. The next prime is 256532519. The reversal of 256532515 is 515235652.

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

It is not a de Polignac number, because 256532515 - 2⁵ = 256532483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256532519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48486 + ... + 53515.

It is an arithmetic number, because the mean of its divisors is an integer number (38556756).

Almost surely, 2^256532515 is an apocalyptic number.

256532515 is a deficient number, since it is larger than the sum of its proper divisors (51921533).

256532515 is a wasteful number, since it uses less digits than its factorization.

256532515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102509.

The product of its digits is 45000, while the sum is 34.

The square root of 256532515 is about 16016.6324488015. The cubic root of 256532515 is about 635.4003840290.

The spelling of 256532515 in words is "two hundred fifty-six million, five hundred thirty-two thousand, five hundred fifteen".