51818994 has 32 divisors (see below), whose sum is σ = 115610880. Its totient is φ = 17204400.

The previous prime is 51818971. The next prime is 51819013. The reversal of 51818994 is 49981815.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12864 + ... + 16404.

It is an arithmetic number, because the mean of its divisors is an integer number (3612840).

Almost surely, 2^51818994 is an apocalyptic number.

51818994 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

51818994 is an abundant number, since it is smaller than the sum of its proper divisors (63791886).

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

51818994 is a wasteful number, since it uses less digits than its factorization.

51818994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823 (or 3817 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 51818994 is about 7198.5411021956. The cubic root of 51818994 is about 372.8175308502.

The spelling of 51818994 in words is "fifty-one million, eight hundred eighteen thousand, nine hundred ninety-four".