51251242 has 16 divisors (see below), whose sum is σ = 88079040. Its totient is φ = 21909888.

The previous prime is 51251219. The next prime is 51251269. The reversal of 51251242 is 24215215.

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, 1498 + ... + 10234.

It is an arithmetic number, because the mean of its divisors is an integer number (5504940).

Almost surely, 2^51251242 is an apocalyptic number.

51251242 is a deficient number, since it is larger than the sum of its proper divisors (36827798).

51251242 is a wasteful number, since it uses less digits than its factorization.

51251242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9165.

The product of its digits is 800, while the sum is 22.

The square root of 51251242 is about 7158.9972761554. The cubic root of 51251242 is about 371.4509426227.

Adding to 51251242 its reverse (24215215), we get a palindrome (75466457).

The spelling of 51251242 in words is "fifty-one million, two hundred fifty-one thousand, two hundred forty-two".