86236981 has 18 divisors (see below), whose sum is σ = 93045446. Its totient is φ = 79900800.

The previous prime is 86236961. The next prime is 86236987. The reversal of 86236981 is 18963268.

It can be written as a sum of positive squares in 9 ways, for example, as 76842756 + 9394225 = 8766^2 + 3065^2 .

It is not a de Polignac number, because 86236981 - 2²⁵ = 52682549 is a prime.

It is a super-2 number, since 2×86236981² = 14873633783988722, which 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 (86236987) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1413691 + ... + 1413751.

Almost surely, 2^86236981 is an apocalyptic number.

It is an amenable number.

86236981 is a deficient number, since it is larger than the sum of its proper divisors (6808465).

86236981 is an equidigital number, since it uses as much as digits as its factorization.

86236981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 131 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 86236981 is about 9286.3868646530. The cubic root of 86236981 is about 441.8055644467.

The spelling of 86236981 in words is "eighty-six million, two hundred thirty-six thousand, nine hundred eighty-one".