51972381 has 8 divisors (see below), whose sum is σ = 76996160. Its totient is φ = 34648236.

The previous prime is 51972377. The next prime is 51972413. The reversal of 51972381 is 18327915.

It is not a de Polignac number, because 51972381 - 2² = 51972377 is a prime.

It is a super-2 number, since 2×51972381² = 5402256773618322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51972301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 962425 + ... + 962478.

It is an arithmetic number, because the mean of its divisors is an integer number (9624520).

Almost surely, 2^51972381 is an apocalyptic number.

It is an amenable number.

51972381 is a deficient number, since it is larger than the sum of its proper divisors (25023779).

51972381 is a wasteful number, since it uses less digits than its factorization.

51972381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924912 (or 1924906 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 51972381 is about 7209.1872634854. The cubic root of 51972381 is about 373.1850217828.

It can be divided in two parts, 519 and 72381, that added together give a square (72900 = 270²).

The spelling of 51972381 in words is "fifty-one million, nine hundred seventy-two thousand, three hundred eighty-one".