86651639 has 2 divisors, whose sum is σ = 86651640. Its totient is φ = 86651638.

The previous prime is 86651629. The next prime is 86651683. The reversal of 86651639 is 93615668.

It is an a-pointer prime, because the next prime (86651683) can be obtained adding 86651639 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86651639 - 2²⁴ = 69874423 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86651639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86651629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43325819 + 43325820.

It is an arithmetic number, because the mean of its divisors is an integer number (43325820).

Almost surely, 2^86651639 is an apocalyptic number.

86651639 is a deficient number, since it is larger than the sum of its proper divisors (1).

86651639 is an equidigital number, since it uses as much as digits as its factorization.

86651639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 44.

The square root of 86651639 is about 9308.6862123503. The cubic root of 86651639 is about 442.5125518054.

The spelling of 86651639 in words is "eighty-six million, six hundred fifty-one thousand, six hundred thirty-nine".