90318089 has 2 divisors, whose sum is σ = 90318090. Its totient is φ = 90318088.

The previous prime is 90318071. The next prime is 90318101. The reversal of 90318089 is 98081309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50879689 + 39438400 = 7133^2 + 6280^2 .

It is an emirp because it is prime and its reverse (98081309) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90318089 - 2⁸ = 90317833 is a prime.

It is a super-2 number, since 2×90318089² = 16314714401223842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90318029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45159044 + 45159045.

It is an arithmetic number, because the mean of its divisors is an integer number (45159045).

Almost surely, 2^90318089 is an apocalyptic number.

It is an amenable number.

90318089 is a deficient number, since it is larger than the sum of its proper divisors (1).

90318089 is an equidigital number, since it uses as much as digits as its factorization.

90318089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 90318089 is about 9503.5829559172. The cubic root of 90318089 is about 448.6678114961.

The spelling of 90318089 in words is "ninety million, three hundred eighteen thousand, eighty-nine".