256120511 has 2 divisors, whose sum is σ = 256120512. Its totient is φ = 256120510.

The previous prime is 256120507. The next prime is 256120561. The reversal of 256120511 is 115021652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256120511 - 2² = 256120507 is a prime.

It is a super-2 number, since 2×256120511² = 131195432309802242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256120561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128060255 + 128060256.

It is an arithmetic number, because the mean of its divisors is an integer number (128060256).

Almost surely, 2^256120511 is an apocalyptic number.

256120511 is a deficient number, since it is larger than the sum of its proper divisors (1).

256120511 is an equidigital number, since it uses as much as digits as its factorization.

256120511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 256120511 is about 16003.7655256505. The cubic root of 256120511 is about 635.0600402030.

The spelling of 256120511 in words is "two hundred fifty-six million, one hundred twenty thousand, five hundred eleven".