51551992 has 8 divisors (see below), whose sum is σ = 96660000. Its totient is φ = 25775992.

The previous prime is 51551971. The next prime is 51552019. The reversal of 51551992 is 29915515.

It is a tau number, because it is divible by the number of its divisors (8).

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, 3221992 + ... + 3222007.

It is an arithmetic number, because the mean of its divisors is an integer number (12082500).

Almost surely, 2^51551992 is an apocalyptic number.

It is an amenable number.

51551992 is a deficient number, since it is larger than the sum of its proper divisors (45108008).

51551992 is a wasteful number, since it uses less digits than its factorization.

51551992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444005 (or 6444001 counting only the distinct ones).

The product of its digits is 20250, while the sum is 37.

The square root of 51551992 is about 7179.9715876875. The cubic root of 51551992 is about 372.1761026924.

The spelling of 51551992 in words is "fifty-one million, five hundred fifty-one thousand, nine hundred ninety-two".