51508916 has 6 divisors (see below), whose sum is σ = 90140610. Its totient is φ = 25754456.

The previous prime is 51508909. The next prime is 51508957. The reversal of 51508916 is 61980515.

It can be written as a sum of positive squares in only one way, i.e., 43612816 + 7896100 = 6604^2 + 2810^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6438611 + ... + 6438618.

It is an arithmetic number, because the mean of its divisors is an integer number (15023435).

Almost surely, 2^51508916 is an apocalyptic number.

It is an amenable number.

51508916 is a deficient number, since it is larger than the sum of its proper divisors (38631694).

51508916 is a wasteful number, since it uses less digits than its factorization.

51508916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12877233 (or 12877231 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 51508916 is about 7176.9712274747. The cubic root of 51508916 is about 372.0724123883.

The spelling of 51508916 in words is "fifty-one million, five hundred eight thousand, nine hundred sixteen".