51813252 has 36 divisors (see below), whose sum is σ = 132206256. Its totient is φ = 17108400.

The previous prime is 51813239. The next prime is 51813271. The reversal of 51813252 is 25231815.

It is a happy number.

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

It is a super-2 number, since 2×51813252² = 5369226165631008, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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, 2874 + ... + 10577.

It is an arithmetic number, because the mean of its divisors is an integer number (3672396).

Almost surely, 2^51813252 is an apocalyptic number.

It is an amenable number.

51813252 is an abundant number, since it is smaller than the sum of its proper divisors (80393004).

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

51813252 is a wasteful number, since it uses less digits than its factorization.

51813252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13568 (or 13563 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 51813252 is about 7198.1422603336. The cubic root of 51813252 is about 372.8037598551.

The spelling of 51813252 in words is "fifty-one million, eight hundred thirteen thousand, two hundred fifty-two".