251161002 has 24 divisors (see below), whose sum is σ = 545911236. Its totient is φ = 83454336.

The previous prime is 251160971. The next prime is 251161003. The reversal of 251161002 is 200161152.

251161002 is a `hidden beast` number, since 2 + 51 + 1 + 610 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 247779081 + 3381921 = 15741^2 + 1839^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (251161003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16303 + ... + 27714.

Almost surely, 2^251161002 is an apocalyptic number.

251161002 is an abundant number, since it is smaller than the sum of its proper divisors (294750234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251161002 is a wasteful number, since it uses less digits than its factorization.

251161002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44342 (or 44339 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 251161002 is about 15848.0598812599. The cubic root of 251161002 is about 630.9341998205.

The spelling of 251161002 in words is "two hundred fifty-one million, one hundred sixty-one thousand, two".