51619816 has 8 divisors (see below), whose sum is σ = 96787170. Its totient is φ = 25809904.

The previous prime is 51619801. The next prime is 51619849. The reversal of 51619816 is 61891615.

It can be written as a sum of positive squares in only one way, i.e., 44275716 + 7344100 = 6654^2 + 2710^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3226231 + ... + 3226246.

Almost surely, 2^51619816 is an apocalyptic number.

It is an amenable number.

51619816 is a deficient number, since it is larger than the sum of its proper divisors (45167354).

51619816 is a wasteful number, since it uses less digits than its factorization.

51619816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6452483 (or 6452479 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The square root of 51619816 is about 7184.6931736853. The cubic root of 51619816 is about 372.3392480859.

The spelling of 51619816 in words is "fifty-one million, six hundred nineteen thousand, eight hundred sixteen".