90605789 has 2 divisors, whose sum is σ = 90605790. Its totient is φ = 90605788.

The previous prime is 90605771. The next prime is 90605791. The reversal of 90605789 is 98750609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58400164 + 32205625 = 7642^2 + 5675^2 .

It is an emirp because it is prime and its reverse (98750609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90605789 - 2¹⁶ = 90540253 is a prime.

It is a Sophie Germain prime.

Together with 90605791, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90605719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45302894 + 45302895.

It is an arithmetic number, because the mean of its divisors is an integer number (45302895).

Almost surely, 2^90605789 is an apocalyptic number.

It is an amenable number.

90605789 is a deficient number, since it is larger than the sum of its proper divisors (1).

90605789 is an equidigital number, since it uses as much as digits as its factorization.

90605789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 90605789 is about 9518.7073176981. The cubic root of 90605789 is about 449.1437032895.

The spelling of 90605789 in words is "ninety million, six hundred five thousand, seven hundred eighty-nine".