90684089 has 2 divisors, whose sum is σ = 90684090. Its totient is φ = 90684088.

The previous prime is 90684079. The next prime is 90684091. The reversal of 90684089 is 98048609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53875600 + 36808489 = 7340^2 + 6067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90684089 is a prime.

Together with 90684091, 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 (90684019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45342044 + 45342045.

It is an arithmetic number, because the mean of its divisors is an integer number (45342045).

Almost surely, 2^90684089 is an apocalyptic number.

It is an amenable number.

90684089 is a deficient number, since it is larger than the sum of its proper divisors (1).

90684089 is an equidigital number, since it uses as much as digits as its factorization.

90684089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 90684089 is about 9522.8193829349. The cubic root of 90684089 is about 449.2730468510.

The spelling of 90684089 in words is "ninety million, six hundred eighty-four thousand, eighty-nine".