51961684 has 6 divisors (see below), whose sum is σ = 90932954. Its totient is φ = 25980840.

The previous prime is 51961681. The next prime is 51961709. The reversal of 51961684 is 48616915.

It can be written as a sum of positive squares in only one way, i.e., 41216400 + 10745284 = 6420^2 + 3278^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51961681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6495207 + ... + 6495214.

Almost surely, 2^51961684 is an apocalyptic number.

It is an amenable number.

51961684 is a deficient number, since it is larger than the sum of its proper divisors (38971270).

51961684 is a wasteful number, since it uses less digits than its factorization.

51961684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12990425 (or 12990423 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 51961684 is about 7208.4453247562. The cubic root of 51961684 is about 373.1594169391.

The spelling of 51961684 in words is "fifty-one million, nine hundred sixty-one thousand, six hundred eighty-four".