251056163 has 4 divisors (see below), whose sum is σ = 251092920. Its totient is φ = 251019408.

The previous prime is 251056123. The next prime is 251056241. The reversal of 251056163 is 361650152.

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 251056163 - 2⁸ = 251055907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251056123) 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, 4778 + ... + 22911.

It is an arithmetic number, because the mean of its divisors is an integer number (62773230).

Almost surely, 2^251056163 is an apocalyptic number.

251056163 is a deficient number, since it is larger than the sum of its proper divisors (36757).

251056163 is an equidigital number, since it uses as much as digits as its factorization.

251056163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36756.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 251056163 is about 15844.7519071773. The cubic root of 251056163 is about 630.8463999422.

The spelling of 251056163 in words is "two hundred fifty-one million, fifty-six thousand, one hundred sixty-three".