251042402 has 64 divisors (see below), whose sum is σ = 447820800. Its totient is φ = 105131520.

The previous prime is 251042377. The next prime is 251042411. The reversal of 251042402 is 204240152.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2588018 + ... + 2588114.

It is an arithmetic number, because the mean of its divisors is an integer number (6997200).

Almost surely, 2^251042402 is an apocalyptic number.

251042402 is a deficient number, since it is larger than the sum of its proper divisors (196778398).

251042402 is a wasteful number, since it uses less digits than its factorization.

251042402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 251042402 is about 15844.3176564975. The cubic root of 251042402 is about 630.8348736555.

Adding to 251042402 its reverse (204240152), we get a palindrome (455282554).

The spelling of 251042402 in words is "two hundred fifty-one million, forty-two thousand, four hundred two".