251315163 has 16 divisors (see below), whose sum is σ = 406166400. Its totient is φ = 152312040.

The previous prime is 251315153. The next prime is 251315209. The reversal of 251315163 is 361513152.

It is not a de Polignac number, because 251315163 - 2¹⁷ = 251184091 is a prime.

It is a super-2 number, since 2×251315163² = 126318622307433138, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (251315153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422793 + ... + 423386.

It is an arithmetic number, because the mean of its divisors is an integer number (25385400).

Almost surely, 2^251315163 is an apocalyptic number.

251315163 is a deficient number, since it is larger than the sum of its proper divisors (154851237).

251315163 is a wasteful number, since it uses less digits than its factorization.

251315163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846199 (or 846193 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 251315163 is about 15852.9228535308. The cubic root of 251315163 is about 631.0632611967.

The spelling of 251315163 in words is "two hundred fifty-one million, three hundred fifteen thousand, one hundred sixty-three".