51123531 has 8 divisors (see below), whose sum is σ = 68208784. Its totient is φ = 34060320.

The previous prime is 51123511. The next prime is 51123599. The reversal of 51123531 is 13532115.

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

It is not a de Polignac number, because 51123531 - 2¹⁰ = 51122507 is a prime.

It is a super-2 number, since 2×51123531² = 5227230843815922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51123498 and 51123507.

It is not an unprimeable number, because it can be changed into a prime (51123511) 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, 1005 + ... + 10161.

It is an arithmetic number, because the mean of its divisors is an integer number (8526098).

Almost surely, 2^51123531 is an apocalyptic number.

51123531 is a deficient number, since it is larger than the sum of its proper divisors (17085253).

51123531 is a wasteful number, since it uses less digits than its factorization.

51123531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11021.

The product of its digits is 450, while the sum is 21.

The square root of 51123531 is about 7150.0720975386. The cubic root of 51123531 is about 371.1421512165.

Adding to 51123531 its reverse (13532115), we get a palindrome (64655646).

It can be divided in two parts, 511 and 23531, that added together give a palindrome (24042).

The spelling of 51123531 in words is "fifty-one million, one hundred twenty-three thousand, five hundred thirty-one".