631147523 has 2 divisors, whose sum is σ = 631147524. Its totient is φ = 631147522.

The previous prime is 631147513. The next prime is 631147549. The reversal of 631147523 is 325741136.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631147523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631147523.

It is not a weakly prime, because it can be changed into another prime (631147513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315573761 + 315573762.

It is an arithmetic number, because the mean of its divisors is an integer number (315573762).

Almost surely, 2^631147523 is an apocalyptic number.

631147523 is a deficient number, since it is larger than the sum of its proper divisors (1).

631147523 is an equidigital number, since it uses as much as digits as its factorization.

631147523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 32.

The square root of 631147523 is about 25122.6496015050. The cubic root of 631147523 is about 857.7820633965.

Adding to 631147523 its reverse (325741136), we get a palindrome (956888659).

The spelling of 631147523 in words is "six hundred thirty-one million, one hundred forty-seven thousand, five hundred twenty-three".