51808494 has 16 divisors (see below), whose sum is σ = 103727232. Its totient is φ = 17251128.

The previous prime is 51808457. The next prime is 51808499. The reversal of 51808494 is 49480815.

51808494 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51808499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2317 + ... + 10439.

It is an arithmetic number, because the mean of its divisors is an integer number (6482952).

Almost surely, 2^51808494 is an apocalyptic number.

51808494 is an abundant number, since it is smaller than the sum of its proper divisors (51918738).

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

51808494 is a wasteful number, since it uses less digits than its factorization.

51808494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9191.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 51808494 is about 7197.8117508032. The cubic root of 51808494 is about 372.7923480089.

The spelling of 51808494 in words is "fifty-one million, eight hundred eight thousand, four hundred ninety-four".