251331042 has 16 divisors (see below), whose sum is σ = 504822240. Its totient is φ = 83416992.

The previous prime is 251331019. The next prime is 251331049. The reversal of 251331042 is 240133152.

It is not an unprimeable number, because it can be changed into a prime (251331049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88492 + ... + 91287.

It is an arithmetic number, because the mean of its divisors is an integer number (31551390).

Almost surely, 2^251331042 is an apocalyptic number.

251331042 is an abundant number, since it is smaller than the sum of its proper divisors (253491198).

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

251331042 is a wasteful number, since it uses less digits than its factorization.

251331042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180017.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 251331042 is about 15853.4236680914. The cubic root of 251331042 is about 631.0765518691.

Adding to 251331042 its reverse (240133152), we get a palindrome (491464194).

The spelling of 251331042 in words is "two hundred fifty-one million, three hundred thirty-one thousand, forty-two".