51721802 has 16 divisors (see below), whose sum is σ = 88316352. Its totient is φ = 22487520.

The previous prime is 51721801. The next prime is 51721807. The reversal of 51721802 is 20812715.

It is not an unprimeable number, because it can be changed into a prime (51721801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50603 + ... + 51614.

It is an arithmetic number, because the mean of its divisors is an integer number (5519772).

Almost surely, 2^51721802 is an apocalyptic number.

51721802 is a deficient number, since it is larger than the sum of its proper divisors (36594550).

51721802 is a wasteful number, since it uses less digits than its factorization.

51721802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102253.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 51721802 is about 7191.7871214323. The cubic root of 51721802 is about 372.5842987448.

The spelling of 51721802 in words is "fifty-one million, seven hundred twenty-one thousand, eight hundred two".