51393616 has 10 divisors (see below), whose sum is σ = 99575162. Its totient is φ = 25696800.

The previous prime is 51393599. The next prime is 51393637. The reversal of 51393616 is 61639315.

It can be written as a sum of positive squares in only one way, i.e., 50353216 + 1040400 = 7096^2 + 1020^2 .

It is a super-3 number, since 3×51393616³ (a number of 24 digits) contains 333 as substring.

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, 1606035 + ... + 1606066.

Almost surely, 2^51393616 is an apocalyptic number.

It is an amenable number.

51393616 is a deficient number, since it is larger than the sum of its proper divisors (48181546).

51393616 is a wasteful number, since it uses less digits than its factorization.

51393616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212109 (or 3212103 counting only the distinct ones).

The product of its digits is 14580, while the sum is 34.

The square root of 51393616 is about 7168.9340909231. The cubic root of 51393616 is about 371.7945834730.

The spelling of 51393616 in words is "fifty-one million, three hundred ninety-three thousand, six hundred sixteen".