86391061 has 2 divisors, whose sum is σ = 86391062. Its totient is φ = 86391060.

The previous prime is 86391049. The next prime is 86391077. The reversal of 86391061 is 16019368.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80892036 + 5499025 = 8994^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 86391061 - 2¹¹ = 86389013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86398061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43195530 + 43195531.

It is an arithmetic number, because the mean of its divisors is an integer number (43195531).

Almost surely, 2^86391061 is an apocalyptic number.

It is an amenable number.

86391061 is a deficient number, since it is larger than the sum of its proper divisors (1).

86391061 is an equidigital number, since it uses as much as digits as its factorization.

86391061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 86391061 is about 9294.6791768194. The cubic root of 86391061 is about 442.0685332196.

The spelling of 86391061 in words is "eighty-six million, three hundred ninety-one thousand, sixty-one".