86990689 has 2 divisors, whose sum is σ = 86990690. Its totient is φ = 86990688.

The previous prime is 86990653. The next prime is 86990699. The reversal of 86990689 is 98609968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85248289 + 1742400 = 9233^2 + 1320^2 .

It is a cyclic number.

It is not a de Polignac number, because 86990689 - 2⁹ = 86990177 is a prime.

It is not a weakly prime, because it can be changed into another prime (86990609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43495344 + 43495345.

It is an arithmetic number, because the mean of its divisors is an integer number (43495345).

Almost surely, 2^86990689 is an apocalyptic number.

It is an amenable number.

86990689 is a deficient number, since it is larger than the sum of its proper divisors (1).

86990689 is an equidigital number, since it uses as much as digits as its factorization.

86990689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 86990689 is about 9326.8799177431. The cubic root of 86990689 is about 443.0889541401.

The spelling of 86990689 in words is "eighty-six million, nine hundred ninety thousand, six hundred eighty-nine".