51818685 has 32 divisors (see below), whose sum is σ = 86384640. Its totient is φ = 26500608.

The previous prime is 51818677. The next prime is 51818687. The reversal of 51818685 is 58681815.

It is a happy number.

It is not a de Polignac number, because 51818685 - 2³ = 51818677 is a prime.

It is a super-2 number, since 2×51818685² = 5370352230258450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51818687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39876 + ... + 41154.

It is an arithmetic number, because the mean of its divisors is an integer number (2699520).

Almost surely, 2^51818685 is an apocalyptic number.

It is an amenable number.

51818685 is a deficient number, since it is larger than the sum of its proper divisors (34565955).

51818685 is a wasteful number, since it uses less digits than its factorization.

51818685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397.

The product of its digits is 76800, while the sum is 42.

The square root of 51818685 is about 7198.5196394814. The cubic root of 51818685 is about 372.8167898038.

The spelling of 51818685 in words is "fifty-one million, eight hundred eighteen thousand, six hundred eighty-five".