51131516 has 6 divisors (see below), whose sum is σ = 89480160. Its totient is φ = 25565756.

The previous prime is 51131501. The next prime is 51131537. The reversal of 51131516 is 61513115.

It is a super-2 number, since 2×51131516² = 5228863856916512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51131491 and 51131500.

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, 6391436 + ... + 6391443.

It is an arithmetic number, because the mean of its divisors is an integer number (14913360).

Almost surely, 2^51131516 is an apocalyptic number.

It is an amenable number.

51131516 is a deficient number, since it is larger than the sum of its proper divisors (38348644).

51131516 is a wasteful number, since it uses less digits than its factorization.

51131516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12782883 (or 12782881 counting only the distinct ones).

The product of its digits is 450, while the sum is 23.

The square root of 51131516 is about 7150.6304617145. The cubic root of 51131516 is about 371.1614731461.

The spelling of 51131516 in words is "fifty-one million, one hundred thirty-one thousand, five hundred sixteen".