631183997 has 2 divisors, whose sum is σ = 631183998. Its totient is φ = 631183996.

The previous prime is 631183961. The next prime is 631184051. The reversal of 631183997 is 799381136.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 568631716 + 62552281 = 23846^2 + 7909^2 .

It is a cyclic number.

It is not a de Polignac number, because 631183997 - 2⁸ = 631183741 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631183297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315591998 + 315591999.

It is an arithmetic number, because the mean of its divisors is an integer number (315591999).

Almost surely, 2^631183997 is an apocalyptic number.

It is an amenable number.

631183997 is a deficient number, since it is larger than the sum of its proper divisors (1).

631183997 is an equidigital number, since it uses as much as digits as its factorization.

631183997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 631183997 is about 25123.3755096723. The cubic root of 631183997 is about 857.7985868131.

The spelling of 631183997 in words is "six hundred thirty-one million, one hundred eighty-three thousand, nine hundred ninety-seven".