51611636 has 12 divisors (see below), whose sum is σ = 90780228. Its totient is φ = 25674432.

The previous prime is 51611629. The next prime is 51611647. The reversal of 51611636 is 63611615.

It can be written as a sum of positive squares in 2 ways, for example, as 41088100 + 10523536 = 6410^2 + 3244^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51611599 and 51611608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31961 + ... + 33536.

It is an arithmetic number, because the mean of its divisors is an integer number (7565019).

Almost surely, 2^51611636 is an apocalyptic number.

It is an amenable number.

51611636 is a deficient number, since it is larger than the sum of its proper divisors (39168592).

51611636 is a wasteful number, since it uses less digits than its factorization.

51611636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65698 (or 65696 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 51611636 is about 7184.1238853461. The cubic root of 51611636 is about 372.3195793089.

The spelling of 51611636 in words is "fifty-one million, six hundred eleven thousand, six hundred thirty-six".