51361616 has 10 divisors (see below), whose sum is σ = 99513162. Its totient is φ = 25680800.

The previous prime is 51361591. The next prime is 51361621. The reversal of 51361616 is 61616315.

It can be written as a sum of positive squares in only one way, i.e., 44622400 + 6739216 = 6680^2 + 2596^2 .

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, 1605035 + ... + 1605066.

Almost surely, 2^51361616 is an apocalyptic number.

It is an amenable number.

51361616 is a deficient number, since it is larger than the sum of its proper divisors (48151546).

51361616 is a wasteful number, since it uses less digits than its factorization.

51361616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210109 (or 3210103 counting only the distinct ones).

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

The square root of 51361616 is about 7166.7018913863. The cubic root of 51361616 is about 371.7174020528.

The spelling of 51361616 in words is "fifty-one million, three hundred sixty-one thousand, six hundred sixteen".