891117382631 has 8 divisors (see below), whose sum is σ = 1018555300224. Its totient is φ = 763713323640.

The previous prime is 891117382627. The next prime is 891117382643. The reversal of 891117382631 is 136283711198.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 891117382631 - 2² = 891117382627 is a prime.

It is a super-2 number, since 2×891117382631² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 891117382631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891117382531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8408225 + ... + 8513546.

It is an arithmetic number, because the mean of its divisors is an integer number (127319412528).

Almost surely, 2^891117382631 is an apocalyptic number.

891117382631 is a deficient number, since it is larger than the sum of its proper divisors (127437917593).

891117382631 is a wasteful number, since it uses less digits than its factorization.

891117382631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16929301.

The product of its digits is 435456, while the sum is 50.

The spelling of 891117382631 in words is "eight hundred ninety-one billion, one hundred seventeen million, three hundred eighty-two thousand, six hundred thirty-one".