631187617 has 2 divisors, whose sum is σ = 631187618. Its totient is φ = 631187616.

The previous prime is 631187591. The next prime is 631187659. The reversal of 631187617 is 716781136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518063121 + 113124496 = 22761^2 + 10636^2 .

It is a cyclic number.

It is not a de Polignac number, because 631187617 - 2¹⁹ = 630663329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631187617.

It is not a weakly prime, because it can be changed into another prime (631187677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315593808 + 315593809.

It is an arithmetic number, because the mean of its divisors is an integer number (315593809).

Almost surely, 2^631187617 is an apocalyptic number.

It is an amenable number.

631187617 is a deficient number, since it is larger than the sum of its proper divisors (1).

631187617 is an equidigital number, since it uses as much as digits as its factorization.

631187617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The square root of 631187617 is about 25123.4475540281. The cubic root of 631187617 is about 857.8002267073.

The spelling of 631187617 in words is "six hundred thirty-one million, one hundred eighty-seven thousand, six hundred seventeen".