84231891 has 12 divisors (see below), whose sum is σ = 121860960. Its totient is φ = 56065680.

The previous prime is 84231871. The next prime is 84231899. The reversal of 84231891 is 19813248.

It is not a de Polignac number, because 84231891 - 2⁵ = 84231859 is a prime.

It is a super-2 number, since 2×84231891² = 14190022922871762, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (84231899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1131 + ... + 13028.

It is an arithmetic number, because the mean of its divisors is an integer number (10155080).

Almost surely, 2^84231891 is an apocalyptic number.

84231891 is a deficient number, since it is larger than the sum of its proper divisors (37629069).

84231891 is a wasteful number, since it uses less digits than its factorization.

84231891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14826 (or 14823 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 84231891 is about 9177.7933622413. The cubic root of 84231891 is about 438.3545481049.

The spelling of 84231891 in words is "eighty-four million, two hundred thirty-one thousand, eight hundred ninety-one".