52181916 has 12 divisors (see below), whose sum is σ = 121757832. Its totient is φ = 17393968.

The previous prime is 52181911. The next prime is 52181929. The reversal of 52181916 is 61918125.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52181911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2174235 + ... + 2174258.

It is an arithmetic number, because the mean of its divisors is an integer number (10146486).

Almost surely, 2^52181916 is an apocalyptic number.

It is an amenable number.

52181916 is an abundant number, since it is smaller than the sum of its proper divisors (69575916).

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

52181916 is a wasteful number, since it uses less digits than its factorization.

52181916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4348500 (or 4348498 counting only the distinct ones).

The product of its digits is 4320, while the sum is 33.

The square root of 52181916 is about 7223.7051434842. The cubic root of 52181916 is about 373.6858677521.

The spelling of 52181916 in words is "fifty-two million, one hundred eighty-one thousand, nine hundred sixteen".