51721108 has 12 divisors (see below), whose sum is σ = 90583360. Its totient is φ = 25840152.

The previous prime is 51721099. The next prime is 51721127. The reversal of 51721108 is 80112715.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1573 + ... + 10291.

Almost surely, 2^51721108 is an apocalyptic number.

It is an amenable number.

51721108 is a deficient number, since it is larger than the sum of its proper divisors (38862252).

51721108 is a wasteful number, since it uses less digits than its factorization.

51721108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206 (or 10204 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 51721108 is about 7191.7388717889. The cubic root of 51721108 is about 372.5826322995.

The spelling of 51721108 in words is "fifty-one million, seven hundred twenty-one thousand, one hundred eight".