51499172 has 6 divisors (see below), whose sum is σ = 90123558. Its totient is φ = 25749584.

The previous prime is 51499163. The next prime is 51499181. The reversal of 51499172 is 27199415.

It is an interprime number because it is at equal distance from previous prime (51499163) and next prime (51499181).

It can be written as a sum of positive squares in only one way, i.e., 43112356 + 8386816 = 6566^2 + 2896^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6437393 + ... + 6437400.

It is an arithmetic number, because the mean of its divisors is an integer number (15020593).

Almost surely, 2^51499172 is an apocalyptic number.

It is an amenable number.

51499172 is a deficient number, since it is larger than the sum of its proper divisors (38624386).

51499172 is a wasteful number, since it uses less digits than its factorization.

51499172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12874797 (or 12874795 counting only the distinct ones).

The product of its digits is 22680, while the sum is 38.

The square root of 51499172 is about 7176.2923574782. The cubic root of 51499172 is about 372.0489491221.

The spelling of 51499172 in words is "fifty-one million, four hundred ninety-nine thousand, one hundred seventy-two".