251113242 has 16 divisors (see below), whose sum is σ = 504042912. Its totient is φ = 83401680.

The previous prime is 251113231. The next prime is 251113243. The reversal of 251113242 is 242311152.

It is not an unprimeable number, because it can be changed into a prime (251113243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73884 + ... + 77207.

It is an arithmetic number, because the mean of its divisors is an integer number (31502682).

Almost surely, 2^251113242 is an apocalyptic number.

251113242 is an abundant number, since it is smaller than the sum of its proper divisors (252929670).

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

251113242 is a wasteful number, since it uses less digits than its factorization.

251113242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151373.

The product of its digits is 480, while the sum is 21.

The square root of 251113242 is about 15846.5530005740. The cubic root of 251113242 is about 630.8942051194.

Adding to 251113242 its reverse (242311152), we get a palindrome (493424394).

It can be divided in two parts, 2511 and 13242, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 251113242 in words is "two hundred fifty-one million, one hundred thirteen thousand, two hundred forty-two".