51531423 has 8 divisors (see below), whose sum is σ = 70005168. Its totient is φ = 33705984.

The previous prime is 51531419. The next prime is 51531427. The reversal of 51531423 is 32413515.

It is an interprime number because it is at equal distance from previous prime (51531419) and next prime (51531427).

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

It is not a de Polignac number, because 51531423 - 2² = 51531419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51531393 and 51531402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531427) 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, 161890 + ... + 162207.

It is an arithmetic number, because the mean of its divisors is an integer number (8750646).

Almost surely, 2^51531423 is an apocalyptic number.

51531423 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

51531423 is a deficient number, since it is larger than the sum of its proper divisors (18473745).

51531423 is a wasteful number, since it uses less digits than its factorization.

51531423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324153.

The product of its digits is 1800, while the sum is 24.

The square root of 51531423 is about 7178.5390574963. The cubic root of 51531423 is about 372.1265972752.

Adding to 51531423 its reverse (32413515), we get a palindrome (83944938).

The spelling of 51531423 in words is "fifty-one million, five hundred thirty-one thousand, four hundred twenty-three".