51494994 has 64 divisors (see below), whose sum is σ = 119201280. Its totient is φ = 16465680.

The previous prime is 51494987. The next prime is 51495011. The reversal of 51494994 is 49949415.

51494994 is a `hidden beast` number, since 514 + 9 + 49 + 94 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155409 + ... + 155739.

It is an arithmetic number, because the mean of its divisors is an integer number (1862520).

Almost surely, 2^51494994 is an apocalyptic number.

51494994 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51494994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59600640).

51494994 is an abundant number, since it is smaller than the sum of its proper divisors (67706286).

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

51494994 is a wasteful number, since it uses less digits than its factorization.

51494994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 446 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 51494994 is about 7176.0012541805. The cubic root of 51494994 is about 372.0388877141.

The spelling of 51494994 in words is "fifty-one million, four hundred ninety-four thousand, nine hundred ninety-four".