51281992 has 8 divisors (see below), whose sum is σ = 96153750. Its totient is φ = 25640992.

The previous prime is 51281987. The next prime is 51282053. The reversal of 51281992 is 29918215.

It can be written as a sum of positive squares in only one way, i.e., 36796356 + 14485636 = 6066^2 + 3806^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3205117 + ... + 3205132.

Almost surely, 2^51281992 is an apocalyptic number.

It is an amenable number.

51281992 is a deficient number, since it is larger than the sum of its proper divisors (44871758).

51281992 is a wasteful number, since it uses less digits than its factorization.

51281992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410255 (or 6410251 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The square root of 51281992 is about 7161.1446012492. The cubic root of 51281992 is about 371.5252161585.

The spelling of 51281992 in words is "fifty-one million, two hundred eighty-one thousand, nine hundred ninety-two".