51811894 has 8 divisors (see below), whose sum is σ = 78086808. Its totient is φ = 25782960.

The previous prime is 51811883. The next prime is 51811901. The reversal of 51811894 is 49811815.

51811894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 60967 + ... + 61810.

It is an arithmetic number, because the mean of its divisors is an integer number (9760851).

Almost surely, 2^51811894 is an apocalyptic number.

51811894 is a deficient number, since it is larger than the sum of its proper divisors (26274914).

51811894 is a wasteful number, since it uses less digits than its factorization.

51811894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122990.

The product of its digits is 11520, while the sum is 37.

The square root of 51811894 is about 7198.0479298210. The cubic root of 51811894 is about 372.8005028252.

The spelling of 51811894 in words is "fifty-one million, eight hundred eleven thousand, eight hundred ninety-four".