51031636 has 6 divisors (see below), whose sum is σ = 89305370. Its totient is φ = 25515816.

The previous prime is 51031597. The next prime is 51031649. The reversal of 51031636 is 63613015.

It can be written as a sum of positive squares in only one way, i.e., 32490000 + 18541636 = 5700^2 + 4306^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51031636.

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, 6378951 + ... + 6378958.

Almost surely, 2^51031636 is an apocalyptic number.

It is an amenable number.

51031636 is a deficient number, since it is larger than the sum of its proper divisors (38273734).

51031636 is a wasteful number, since it uses less digits than its factorization.

51031636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12757913 (or 12757911 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 51031636 is about 7143.6430481933. The cubic root of 51031636 is about 370.9196407398.

The spelling of 51031636 in words is "fifty-one million, thirty-one thousand, six hundred thirty-six".