631487997 has 24 divisors (see below), whose sum is σ = 1043115840. Its totient is φ = 360622080.

The previous prime is 631487959. The next prime is 631488037. The reversal of 631487997 is 799784136.

It is a happy number.

It is not a de Polignac number, because 631487997 - 2¹¹ = 631485949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631487897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188029 + ... + 191357.

It is an arithmetic number, because the mean of its divisors is an integer number (43463160).

Almost surely, 2^631487997 is an apocalyptic number.

It is an amenable number.

631487997 is a deficient number, since it is larger than the sum of its proper divisors (411627843).

631487997 is a wasteful number, since it uses less digits than its factorization.

631487997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6353 (or 6350 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 631487997 is about 25129.4249237821. The cubic root of 631487997 is about 857.9362798458.

The spelling of 631487997 in words is "six hundred thirty-one million, four hundred eighty-seven thousand, nine hundred ninety-seven".