8631344632391 has 4 divisors (see below), whose sum is σ = 9295294219512. Its totient is φ = 7967395045272.

The previous prime is 8631344632357. The next prime is 8631344632411. The reversal of 8631344632391 is 1932364431368.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8631344632391 - 2¹⁴ = 8631344616007 is a prime.

It is a super-2 number, since 2×8631344632391² (a number of 27 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 (8631344832391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331974793541 + ... + 331974793566.

It is an arithmetic number, because the mean of its divisors is an integer number (2323823554878).

Almost surely, 2^{8631344632391} is an apocalyptic number.

8631344632391 is a deficient number, since it is larger than the sum of its proper divisors (663949587121).

8631344632391 is a wasteful number, since it uses less digits than its factorization.

8631344632391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663949587120.

The product of its digits is 6718464, while the sum is 53.

The spelling of 8631344632391 in words is "eight trillion, six hundred thirty-one billion, three hundred forty-four million, six hundred thirty-two thousand, three hundred ninety-one".