86170981 has 4 divisors (see below), whose sum is σ = 92799532. Its totient is φ = 79542432.

The previous prime is 86170967. The next prime is 86170993. The reversal of 86170981 is 18907168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55368481 + 30802500 = 7441^2 + 5550^2 .

It is a cyclic number.

It is not a de Polignac number, because 86170981 - 2²⁵ = 52616549 is a prime.

It is a super-2 number, since 2×86170981² = 14850875933004722, 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 (86170901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3314256 + ... + 3314281.

It is an arithmetic number, because the mean of its divisors is an integer number (23199883).

Almost surely, 2^86170981 is an apocalyptic number.

It is an amenable number.

86170981 is a deficient number, since it is larger than the sum of its proper divisors (6628551).

86170981 is a wasteful number, since it uses less digits than its factorization.

86170981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628550.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 86170981 is about 9282.8325957113. The cubic root of 86170981 is about 441.6928262343.

The spelling of 86170981 in words is "eighty-six million, one hundred seventy thousand, nine hundred eighty-one".