90689939 has 2 divisors, whose sum is σ = 90689940. Its totient is φ = 90689938.

The previous prime is 90689857. The next prime is 90689941. The reversal of 90689939 is 93998609.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90689939 - 2¹⁶ = 90624403 is a prime.

Together with 90689941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90689959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45344969 + 45344970.

It is an arithmetic number, because the mean of its divisors is an integer number (45344970).

Almost surely, 2^90689939 is an apocalyptic number.

90689939 is a deficient number, since it is larger than the sum of its proper divisors (1).

90689939 is an equidigital number, since it uses as much as digits as its factorization.

90689939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 90689939 is about 9523.1265349149. The cubic root of 90689939 is about 449.2827074608.

The spelling of 90689939 in words is "ninety million, six hundred eighty-nine thousand, nine hundred thirty-nine".