90500089 has 2 divisors, whose sum is σ = 90500090. Its totient is φ = 90500088.

The previous prime is 90500083. The next prime is 90500099. The reversal of 90500089 is 98000509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86638864 + 3861225 = 9308^2 + 1965^2 .

It is an emirp because it is prime and its reverse (98000509) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90500089 is a prime.

It is a super-2 number, since 2×90500089² = 16380532218015842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90500089.

It is not a weakly prime, because it can be changed into another prime (90500083) 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, 45250044 + 45250045.

It is an arithmetic number, because the mean of its divisors is an integer number (45250045).

Almost surely, 2^90500089 is an apocalyptic number.

It is an amenable number.

90500089 is a deficient number, since it is larger than the sum of its proper divisors (1).

90500089 is an equidigital number, since it uses as much as digits as its factorization.

90500089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 90500089 is about 9513.1534729552. The cubic root of 90500089 is about 448.9689794922.

The spelling of 90500089 in words is "ninety million, five hundred thousand, eighty-nine".