251085402 has 24 divisors (see below), whose sum is σ = 546145236. Its totient is φ = 83367936.

The previous prime is 251085391. The next prime is 251085403. The reversal of 251085402 is 204580152.

It is a happy number.

251085402 is a `hidden beast` number, since 251 + 0 + 8 + 5 + 402 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 246458601 + 4626801 = 15699^2 + 2151^2 .

It is not an unprimeable number, because it can be changed into a prime (251085403) 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, 22513 + ... + 31764.

Almost surely, 2^251085402 is an apocalyptic number.

251085402 is an abundant number, since it is smaller than the sum of its proper divisors (295059834).

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

251085402 is a wasteful number, since it uses less digits than its factorization.

251085402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54542 (or 54539 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 251085402 is about 15845.6745517507. The cubic root of 251085402 is about 630.8708892857.

The spelling of 251085402 in words is "two hundred fifty-one million, eighty-five thousand, four hundred two".