51397072 has 10 divisors (see below), whose sum is σ = 99581858. Its totient is φ = 25698528.

The previous prime is 51397061. The next prime is 51397081. The reversal of 51397072 is 27079315.

It can be written as a sum of positive squares in only one way, i.e., 45751696 + 5645376 = 6764^2 + 2376^2 .

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, 1606143 + ... + 1606174.

Almost surely, 2^51397072 is an apocalyptic number.

It is an amenable number.

51397072 is a deficient number, since it is larger than the sum of its proper divisors (48184786).

51397072 is a wasteful number, since it uses less digits than its factorization.

51397072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212325 (or 3212319 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 51397072 is about 7169.1751268887. The cubic root of 51397072 is about 371.8029171493.

The spelling of 51397072 in words is "fifty-one million, three hundred ninety-seven thousand, seventy-two".