51984581 has 8 divisors (see below), whose sum is σ = 56766528. Its totient is φ = 47212000.

The previous prime is 51984533. The next prime is 51984641. The reversal of 51984581 is 18548915.

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

It is not a de Polignac number, because 51984581 - 2²² = 47790277 is a prime.

It is a super-2 number, since 2×51984581² = 5404793323491122, 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 (51981581) 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, 14696 + ... + 17886.

It is an arithmetic number, because the mean of its divisors is an integer number (7095816).

Almost surely, 2^51984581 is an apocalyptic number.

It is an amenable number.

51984581 is a deficient number, since it is larger than the sum of its proper divisors (4781947).

51984581 is a wasteful number, since it uses less digits than its factorization.

51984581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4683.

The product of its digits is 57600, while the sum is 41.

The square root of 51984581 is about 7210.0333563722. The cubic root of 51984581 is about 373.2142199902.

It can be divided in two parts, 5198 and 4581, that added together give a palindrome (9779).

The spelling of 51984581 in words is "fifty-one million, nine hundred eighty-four thousand, five hundred eighty-one".