251322242 has 16 divisors (see below), whose sum is σ = 397058112. Its totient is φ = 119071920.

The previous prime is 251322223. The next prime is 251322259. The reversal of 251322242 is 242223152.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 20609 + ... + 30452.

It is an arithmetic number, because the mean of its divisors is an integer number (24816132).

Almost surely, 2^251322242 is an apocalyptic number.

251322242 is a deficient number, since it is larger than the sum of its proper divisors (145735870).

251322242 is a wasteful number, since it uses less digits than its factorization.

251322242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51193.

The product of its digits is 1920, while the sum is 23.

The square root of 251322242 is about 15853.1461230886. The cubic root of 251322242 is about 631.0691863663.

Adding to 251322242 its reverse (242223152), we get a palindrome (493545394).

The spelling of 251322242 in words is "two hundred fifty-one million, three hundred twenty-two thousand, two hundred forty-two".