8641998631 has 6 divisors (see below), whose sum is σ = 10052937240. Its totient is φ = 7407427356.

The previous prime is 8641998623. The next prime is 8641998667. The reversal of 8641998631 is 1368991468.

It is not a de Polignac number, because 8641998631 - 2³ = 8641998623 is a prime.

It is a super-2 number, since 2×8641998631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8641998691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88183611 + ... + 88183708.

It is an arithmetic number, because the mean of its divisors is an integer number (1675489540).

Almost surely, 2^8641998631 is an apocalyptic number.

8641998631 is a deficient number, since it is larger than the sum of its proper divisors (1410938609).

8641998631 is a wasteful number, since it uses less digits than its factorization.

8641998631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176367333 (or 176367326 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The square root of 8641998631 is about 92962.3506103412. The cubic root of 8641998631 is about 2052.1293465419.

The spelling of 8641998631 in words is "eight billion, six hundred forty-one million, nine hundred ninety-eight thousand, six hundred thirty-one".