86190981 has 12 divisors (see below), whose sum is σ = 115831872. Its totient is φ = 57008904.

The previous prime is 86190967. The next prime is 86190989. The reversal of 86190981 is 18909168.

It is not a de Polignac number, because 86190981 - 2²⁶ = 19082117 is a prime.

It is a super-2 number, since 2×86190981² = 14857770411484722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86190989) 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, 57220 + ... + 58706.

It is an arithmetic number, because the mean of its divisors is an integer number (9652656).

Almost surely, 2^86190981 is an apocalyptic number.

It is an amenable number.

86190981 is a deficient number, since it is larger than the sum of its proper divisors (29640891).

86190981 is a wasteful number, since it uses less digits than its factorization.

86190981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768 (or 1629 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 86190981 is about 9283.9097906001. The cubic root of 86190981 is about 441.7269954061.

The spelling of 86190981 in words is "eighty-six million, one hundred ninety thousand, nine hundred eighty-one".