51819516 has 36 divisors (see below), whose sum is σ = 149701552. Its totient is φ = 14805504.

The previous prime is 51819503. The next prime is 51819541. The reversal of 51819516 is 61591815.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102565 + ... + 103068.

Almost surely, 2^51819516 is an apocalyptic number.

It is an amenable number.

51819516 is an abundant number, since it is smaller than the sum of its proper divisors (97882036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51819516 is a wasteful number, since it uses less digits than its factorization.

51819516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205650 (or 205645 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 51819516 is about 7198.5773594510. The cubic root of 51819516 is about 372.8187827084.

The spelling of 51819516 in words is "fifty-one million, eight hundred nineteen thousand, five hundred sixteen".