51615956 has 24 divisors (see below), whose sum is σ = 107721600. Its totient is φ = 21159072.

The previous prime is 51615947. The next prime is 51615959. The reversal of 51615956 is 65951615.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51615959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39431 + ... + 40718.

It is an arithmetic number, because the mean of its divisors is an integer number (4488400).

Almost surely, 2^51615956 is an apocalyptic number.

It is an amenable number.

51615956 is an abundant number, since it is smaller than the sum of its proper divisors (56105644).

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

51615956 is a wasteful number, since it uses less digits than its factorization.

51615956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80183 (or 80181 counting only the distinct ones).

The product of its digits is 40500, while the sum is 38.

The square root of 51615956 is about 7184.4245420214. The cubic root of 51615956 is about 372.3299669904.

The spelling of 51615956 in words is "fifty-one million, six hundred fifteen thousand, nine hundred fifty-six".