86913891 has 20 divisors (see below), whose sum is σ = 133006104. Its totient is φ = 56527200.

The previous prime is 86913889. The next prime is 86913901. The reversal of 86913891 is 19831968.

It is not a de Polignac number, because 86913891 - 2¹ = 86913889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86913821) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9765 + ... + 16406.

Almost surely, 2^86913891 is an apocalyptic number.

86913891 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

86913891 is a deficient number, since it is larger than the sum of its proper divisors (46092213).

86913891 is a wasteful number, since it uses less digits than its factorization.

86913891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26224 (or 26215 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 86913891 is about 9322.7619834468. The cubic root of 86913891 is about 442.9585249928.

The spelling of 86913891 in words is "eighty-six million, nine hundred thirteen thousand, eight hundred ninety-one".