251322402 has 16 divisors (see below), whose sum is σ = 502951680. Its totient is φ = 83722992.

The previous prime is 251322391. The next prime is 251322413. The reversal of 251322402 is 204223152.

251322402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (251322391) and next prime (251322413).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1353 + ... + 22460.

It is an arithmetic number, because the mean of its divisors is an integer number (31434480).

Almost surely, 2^251322402 is an apocalyptic number.

251322402 is an abundant number, since it is smaller than the sum of its proper divisors (251629278).

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

251322402 is a wasteful number, since it uses less digits than its factorization.

251322402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25577.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 251322402 is about 15853.1511694048. The cubic root of 251322402 is about 631.0693202860.

Adding to 251322402 its reverse (204223152), we get a palindrome (455545554).

The spelling of 251322402 in words is "two hundred fifty-one million, three hundred twenty-two thousand, four hundred two".