90579989 has 2 divisors, whose sum is σ = 90579990. Its totient is φ = 90579988.

The previous prime is 90579967. The next prime is 90579991. The reversal of 90579989 is 98997509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69722500 + 20857489 = 8350^2 + 4567^2 .

It is a cyclic number.

It is not a de Polignac number, because 90579989 - 2⁸ = 90579733 is a prime.

Together with 90579991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90579389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45289994 + 45289995.

It is an arithmetic number, because the mean of its divisors is an integer number (45289995).

Almost surely, 2^90579989 is an apocalyptic number.

It is an amenable number.

90579989 is a deficient number, since it is larger than the sum of its proper divisors (1).

90579989 is an equidigital number, since it uses as much as digits as its factorization.

90579989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1837080, while the sum is 56.

The square root of 90579989 is about 9517.3519951718. The cubic root of 90579989 is about 449.1010680167.

The spelling of 90579989 in words is "ninety million, five hundred seventy-nine thousand, nine hundred eighty-nine".