891413631 has 6 divisors (see below), whose sum is σ = 1287597480. Its totient is φ = 594275748.

The previous prime is 891413623. The next prime is 891413641. The reversal of 891413631 is 136314198.

891413631 is a `hidden beast` number, since 8 + 9 + 1 + 4 + 13 + 631 = 666.

It is not a de Polignac number, because 891413631 - 2³ = 891413623 is a prime.

It is a super-2 number, since 2×891413631² = 1589236523065208322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891413641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49522971 + ... + 49522988.

It is an arithmetic number, because the mean of its divisors is an integer number (214599580).

Almost surely, 2^891413631 is an apocalyptic number.

891413631 is a deficient number, since it is larger than the sum of its proper divisors (396183849).

891413631 is a wasteful number, since it uses less digits than its factorization.

891413631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99045965 (or 99045962 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 891413631 is about 29856.5508892102. The cubic root of 891413631 is about 962.4091800740.

The spelling of 891413631 in words is "eight hundred ninety-one million, four hundred thirteen thousand, six hundred thirty-one".