51219996 has 12 divisors (see below), whose sum is σ = 119513352. Its totient is φ = 17073328.

The previous prime is 51219983. The next prime is 51220033. The reversal of 51219996 is 69991215.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134155 + ... + 2134178.

It is an arithmetic number, because the mean of its divisors is an integer number (9959446).

Almost surely, 2^51219996 is an apocalyptic number.

It is an amenable number.

51219996 is an abundant number, since it is smaller than the sum of its proper divisors (68293356).

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

51219996 is a wasteful number, since it uses less digits than its factorization.

51219996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268340 (or 4268338 counting only the distinct ones).

The product of its digits is 43740, while the sum is 42.

The square root of 51219996 is about 7156.8146545792. The cubic root of 51219996 is about 371.3754406111.

The spelling of 51219996 in words is "fifty-one million, two hundred nineteen thousand, nine hundred ninety-six".