256145215 has 8 divisors (see below), whose sum is σ = 307460160. Its totient is φ = 204858912.

The previous prime is 256145207. The next prime is 256145261. The reversal of 256145215 is 512541652.

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

It is a cyclic number.

It is not a de Polignac number, because 256145215 - 2³ = 256145207 is a prime.

It is a super-2 number, since 2×256145215² = 131220742334792450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31722 + ... + 38968.

It is an arithmetic number, because the mean of its divisors is an integer number (38432520).

Almost surely, 2^256145215 is an apocalyptic number.

256145215 is a deficient number, since it is larger than the sum of its proper divisors (51314945).

256145215 is an equidigital number, since it uses as much as digits as its factorization.

256145215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14321.

The product of its digits is 12000, while the sum is 31.

The square root of 256145215 is about 16004.5373253962. The cubic root of 256145215 is about 635.0804576994.

Adding to 256145215 its reverse (512541652), we get a palindrome (768686867).

The spelling of 256145215 in words is "two hundred fifty-six million, one hundred forty-five thousand, two hundred fifteen".