631131023 has 2 divisors, whose sum is σ = 631131024. Its totient is φ = 631131022.

The previous prime is 631130989. The next prime is 631131043. The reversal of 631131023 is 320131136.

It is a happy number.

It is an a-pointer prime, because the next prime (631131043) can be obtained adding 631131023 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631131023 - 2²⁴ = 614353807 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 631130986 and 631131004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631131043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315565511 + 315565512.

It is an arithmetic number, because the mean of its divisors is an integer number (315565512).

Almost surely, 2^631131023 is an apocalyptic number.

631131023 is a deficient number, since it is larger than the sum of its proper divisors (1).

631131023 is an equidigital number, since it uses as much as digits as its factorization.

631131023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 631131023 is about 25122.3212104296. The cubic root of 631131023 is about 857.7745883732.

Adding to 631131023 its reverse (320131136), we get a palindrome (951262159).

The spelling of 631131023 in words is "six hundred thirty-one million, one hundred thirty-one thousand, twenty-three".