51894931 has 8 divisors (see below), whose sum is σ = 59943024. Its totient is φ = 44401920.

The previous prime is 51894929. The next prime is 51894943. The reversal of 51894931 is 13949815.

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 51894931 - 2¹ = 51894929 is a prime.

It is a super-2 number, since 2×51894931² = 5386167726989522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51894991) 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, 138570 + ... + 138943.

It is an arithmetic number, because the mean of its divisors is an integer number (7492878).

Almost surely, 2^51894931 is an apocalyptic number.

51894931 is a deficient number, since it is larger than the sum of its proper divisors (8048093).

51894931 is a wasteful number, since it uses less digits than its factorization.

51894931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277541.

The product of its digits is 38880, while the sum is 40.

The square root of 51894931 is about 7203.8136427867. The cubic root of 51894931 is about 372.9995543699. Note that the first 3 decimals are identical.

Subtracting from 51894931 its reverse (13949815), we obtain a triangular number (37945116 = T₈₇₁₁).

It can be divided in two parts, 51894 and 931, that added together give a palindrome (52825).

The spelling of 51894931 in words is "fifty-one million, eight hundred ninety-four thousand, nine hundred thirty-one".