86321861 has 4 divisors (see below), whose sum is σ = 86401932. Its totient is φ = 86241792.

The previous prime is 86321857. The next prime is 86321867. The reversal of 86321861 is 16812368.

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 85840225 + 481636 = 9265^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 86321861 - 2² = 86321857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86321867) 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, 38396 + ... + 40581.

It is an arithmetic number, because the mean of its divisors is an integer number (21600483).

Almost surely, 2^86321861 is an apocalyptic number.

It is an amenable number.

86321861 is a deficient number, since it is larger than the sum of its proper divisors (80071).

86321861 is a wasteful number, since it uses less digits than its factorization.

86321861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80070.

The product of its digits is 13824, while the sum is 35.

The square root of 86321861 is about 9290.9558711685. The cubic root of 86321861 is about 441.9504680953.

The spelling of 86321861 in words is "eighty-six million, three hundred twenty-one thousand, eight hundred sixty-one".