51231523 has 8 divisors (see below), whose sum is σ = 61994592. Its totient is φ = 41329536.

The previous prime is 51231491. The next prime is 51231547. The reversal of 51231523 is 32513215.

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 51231523 - 2⁵ = 51231491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51231494 and 51231503.

It is not an unprimeable number, because it can be changed into a prime (51231553) 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, 215140 + ... + 215377.

It is an arithmetic number, because the mean of its divisors is an integer number (7749324).

Almost surely, 2^51231523 is an apocalyptic number.

51231523 is a deficient number, since it is larger than the sum of its proper divisors (10763069).

51231523 is a wasteful number, since it uses less digits than its factorization.

51231523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430541.

The product of its digits is 900, while the sum is 22.

The square root of 51231523 is about 7157.6199256457. The cubic root of 51231523 is about 371.4032977238.

Adding to 51231523 its reverse (32513215), we get a palindrome (83744738).

The spelling of 51231523 in words is "fifty-one million, two hundred thirty-one thousand, five hundred twenty-three".