256121051 has 4 divisors (see below), whose sum is σ = 256203600. Its totient is φ = 256038504.

The previous prime is 256121023. The next prime is 256121093. The reversal of 256121051 is 150121652.

It is a happy number.

256121051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 256121051 - 2¹⁸ = 255858907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256121651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36431 + ... + 42888.

It is an arithmetic number, because the mean of its divisors is an integer number (64050900).

Almost surely, 2^256121051 is an apocalyptic number.

256121051 is a deficient number, since it is larger than the sum of its proper divisors (82549).

256121051 is an equidigital number, since it uses as much as digits as its factorization.

256121051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82548.

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

The square root of 256121051 is about 16003.7823966711. The cubic root of 256121051 is about 635.0604865192.

The spelling of 256121051 in words is "two hundred fifty-six million, one hundred twenty-one thousand, fifty-one".