86911639 has 2 divisors, whose sum is σ = 86911640. Its totient is φ = 86911638.

The previous prime is 86911621. The next prime is 86911673. The reversal of 86911639 is 93611968.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86911639 - 2⁵ = 86911607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 86911595 and 86911604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86911609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43455819 + 43455820.

It is an arithmetic number, because the mean of its divisors is an integer number (43455820).

Almost surely, 2^86911639 is an apocalyptic number.

86911639 is a deficient number, since it is larger than the sum of its proper divisors (1).

86911639 is an equidigital number, since it uses as much as digits as its factorization.

86911639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 86911639 is about 9322.6412030068. The cubic root of 86911639 is about 442.9546991709.

The spelling of 86911639 in words is "eighty-six million, nine hundred eleven thousand, six hundred thirty-nine".