51813893 has 8 divisors (see below), whose sum is σ = 54753600. Its totient is φ = 48895488.

The previous prime is 51813889. The next prime is 51813899. The reversal of 51813893 is 39831815.

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

It is a cyclic number.

It is not a de Polignac number, because 51813893 - 2² = 51813889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51813899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188 + ... + 10181.

It is an arithmetic number, because the mean of its divisors is an integer number (6844200).

Almost surely, 2^51813893 is an apocalyptic number.

It is an amenable number.

51813893 is a deficient number, since it is larger than the sum of its proper divisors (2939707).

51813893 is a wasteful number, since it uses less digits than its factorization.

51813893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10651.

The product of its digits is 25920, while the sum is 38.

The square root of 51813893 is about 7198.1867855732. The cubic root of 51813893 is about 372.8052972110.

The spelling of 51813893 in words is "fifty-one million, eight hundred thirteen thousand, eight hundred ninety-three".