256120507 has 2 divisors, whose sum is σ = 256120508. Its totient is φ = 256120506.

The previous prime is 256120499. The next prime is 256120511. The reversal of 256120507 is 705021652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256120507 - 2³ = 256120499 is a prime.

It is not a weakly prime, because it can be changed into another prime (256120577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128060253 + 128060254.

It is an arithmetic number, because the mean of its divisors is an integer number (128060254).

Almost surely, 2^256120507 is an apocalyptic number.

256120507 is a deficient number, since it is larger than the sum of its proper divisors (1).

256120507 is an equidigital number, since it uses as much as digits as its factorization.

256120507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 256120507 is about 16003.7654006799. The cubic root of 256120507 is about 635.0600368970.

The spelling of 256120507 in words is "two hundred fifty-six million, one hundred twenty thousand, five hundred seven".