86731661 has 2 divisors, whose sum is σ = 86731662. Its totient is φ = 86731660.

The previous prime is 86731639. The next prime is 86731669. The reversal of 86731661 is 16613768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51566761 + 35164900 = 7181^2 + 5930^2 .

It is a cyclic number.

It is not a de Polignac number, because 86731661 - 2²⁶ = 19622797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86731669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43365830 + 43365831.

It is an arithmetic number, because the mean of its divisors is an integer number (43365831).

Almost surely, 2^86731661 is an apocalyptic number.

It is an amenable number.

86731661 is a deficient number, since it is larger than the sum of its proper divisors (1).

86731661 is an equidigital number, since it uses as much as digits as its factorization.

86731661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 86731661 is about 9312.9834639604. The cubic root of 86731661 is about 442.6487286661.

The spelling of 86731661 in words is "eighty-six million, seven hundred thirty-one thousand, six hundred sixty-one".