631006431997 has 2 divisors, whose sum is σ = 631006431998. Its totient is φ = 631006431996.

The previous prime is 631006431977. The next prime is 631006432009. The reversal of 631006431997 is 799134600136.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323054687641 + 307951744356 = 568379^2 + 554934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631006431997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631006431997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631006431917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315503215998 + 315503215999.

It is an arithmetic number, because the mean of its divisors is an integer number (315503215999).

Almost surely, 2^631006431997 is an apocalyptic number.

It is an amenable number.

631006431997 is a deficient number, since it is larger than the sum of its proper divisors (1).

631006431997 is an equidigital number, since it uses as much as digits as its factorization.

631006431997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 631006431997 in words is "six hundred thirty-one billion, six million, four hundred thirty-one thousand, nine hundred ninety-seven".