86939491 has 2 divisors, whose sum is σ = 86939492. Its totient is φ = 86939490.

The previous prime is 86939453. The next prime is 86939537. The reversal of 86939491 is 19493968.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86939491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86939431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43469745 + 43469746.

It is an arithmetic number, because the mean of its divisors is an integer number (43469746).

Almost surely, 2^86939491 is an apocalyptic number.

86939491 is a deficient number, since it is larger than the sum of its proper divisors (1).

86939491 is an equidigital number, since it uses as much as digits as its factorization.

86939491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 49.

The square root of 86939491 is about 9324.1348660345. The cubic root of 86939491 is about 443.0020110415.

The spelling of 86939491 in words is "eighty-six million, nine hundred thirty-nine thousand, four hundred ninety-one".