631985097887 has 16 divisors (see below), whose sum is σ = 781549480320. Its totient is φ = 502424661600.

The previous prime is 631985097883. The next prime is 631985097899. The reversal of 631985097887 is 788790589136.

It is a cyclic number.

It is not a de Polignac number, because 631985097887 - 2² = 631985097883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631985097887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631985097883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116299289 + ... + 116304722.

It is an arithmetic number, because the mean of its divisors is an integer number (48846842520).

Almost surely, 2^631985097887 is an apocalyptic number.

631985097887 is a deficient number, since it is larger than the sum of its proper divisors (149564382433).

631985097887 is a wasteful number, since it uses less digits than its factorization.

631985097887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232604054.

The product of its (nonzero) digits is 182891520, while the sum is 71.

The spelling of 631985097887 in words is "six hundred thirty-one billion, nine hundred eighty-five million, ninety-seven thousand, eight hundred eighty-seven".