86143981 has 16 divisors (see below), whose sum is σ = 113719680. Its totient is φ = 63175680.

The previous prime is 86143961. The next prime is 86144021. The reversal of 86143981 is 18934168.

It is a cyclic number.

It is not a de Polignac number, because 86143981 - 2¹¹ = 86141933 is a prime.

It is a super-2 number, since 2×86143981² = 14841570925056722, 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 (86143931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31596 + ... + 34213.

It is an arithmetic number, because the mean of its divisors is an integer number (7107480).

Almost surely, 2^86143981 is an apocalyptic number.

It is an amenable number.

86143981 is a deficient number, since it is larger than the sum of its proper divisors (27575699).

86143981 is a wasteful number, since it uses less digits than its factorization.

86143981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65844.

The product of its digits is 41472, while the sum is 40.

The square root of 86143981 is about 9281.3781843000. The cubic root of 86143981 is about 441.6466894647.

The spelling of 86143981 in words is "eighty-six million, one hundred forty-three thousand, nine hundred eighty-one".