51911316 has 18 divisors (see below), whose sum is σ = 131220362. Its totient is φ = 17303760.

The previous prime is 51911309. The next prime is 51911341. The reversal of 51911316 is 61311915.

It can be written as a sum of positive squares in only one way, i.e., 46294416 + 5616900 = 6804^2 + 2370^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 51911316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 720955 + ... + 721026.

Almost surely, 2^51911316 is an apocalyptic number.

It is an amenable number.

51911316 is an abundant number, since it is smaller than the sum of its proper divisors (79309046).

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

51911316 is a wasteful number, since it uses less digits than its factorization.

51911316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441991 (or 1441986 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 51911316 is about 7204.9507978889. The cubic root of 51911316 is about 373.0388064669.

The spelling of 51911316 in words is "fifty-one million, nine hundred eleven thousand, three hundred sixteen".