631312523 has 2 divisors, whose sum is σ = 631312524. Its totient is φ = 631312522.

The previous prime is 631312501. The next prime is 631312531. The reversal of 631312523 is 325213136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631312523 - 2⁸ = 631312267 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631312492 and 631312501.

It is not a weakly prime, because it can be changed into another prime (631312573) 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 as a sum of consecutive naturals, namely, 315656261 + 315656262.

It is an arithmetic number, because the mean of its divisors is an integer number (315656262).

Almost surely, 2^631312523 is an apocalyptic number.

631312523 is a deficient number, since it is larger than the sum of its proper divisors (1).

631312523 is an equidigital number, since it uses as much as digits as its factorization.

631312523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 26.

The square root of 631312523 is about 25125.9332761989. The cubic root of 631312523 is about 857.8568064655.

Adding to 631312523 its reverse (325213136), we get a palindrome (956525659).

The spelling of 631312523 in words is "six hundred thirty-one million, three hundred twelve thousand, five hundred twenty-three".