631513023 has 4 divisors (see below), whose sum is σ = 842017368. Its totient is φ = 421008680.

The previous prime is 631512953. The next prime is 631513039. The reversal of 631513023 is 320315136.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 631513023 - 2⁸ = 631512767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631512984 and 631513002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631512023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105252168 + ... + 105252173.

It is an arithmetic number, because the mean of its divisors is an integer number (210504342).

Almost surely, 2^631513023 is an apocalyptic number.

631513023 is a deficient number, since it is larger than the sum of its proper divisors (210504345).

631513023 is a wasteful number, since it uses less digits than its factorization.

631513023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210504344.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 631513023 is about 25129.9228610038. The cubic root of 631513023 is about 857.9476130935.

Adding to 631513023 its reverse (320315136), we get a palindrome (951828159).

The spelling of 631513023 in words is "six hundred thirty-one million, five hundred thirteen thousand, twenty-three".