51971737 has 6 divisors (see below), whose sum is σ = 55209038. Its totient is φ = 48914304.

The previous prime is 51971729. The next prime is 51971749. The reversal of 51971737 is 73717915.

It can be written as a sum of positive squares in 3 ways, for example, as 24890121 + 27081616 = 4989^2 + 5204^2 .

It is not a de Polignac number, because 51971737 - 2³ = 51971729 is a prime.

It is a super-2 number, since 2×51971737² = 5402122893594338, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51971737.

It is not an unprimeable number, because it can be changed into a prime (51971767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89628 + ... + 90205.

Almost surely, 2^51971737 is an apocalyptic number.

It is an amenable number.

51971737 is a deficient number, since it is larger than the sum of its proper divisors (3237301).

51971737 is a wasteful number, since it uses less digits than its factorization.

51971737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179867 (or 179850 counting only the distinct ones).

The product of its digits is 46305, while the sum is 40.

The square root of 51971737 is about 7209.1425981180. The cubic root of 51971737 is about 373.1834803735.

The spelling of 51971737 in words is "fifty-one million, nine hundred seventy-one thousand, seven hundred thirty-seven".