90566389 has 2 divisors, whose sum is σ = 90566390. Its totient is φ = 90566388.

The previous prime is 90566381. The next prime is 90566447. The reversal of 90566389 is 98366509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 28708164 = 7865^2 + 5358^2 .

It is an emirp because it is prime and its reverse (98366509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90566389 - 2³ = 90566381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90566381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45283194 + 45283195.

It is an arithmetic number, because the mean of its divisors is an integer number (45283195).

Almost surely, 2^90566389 is an apocalyptic number.

It is an amenable number.

90566389 is a deficient number, since it is larger than the sum of its proper divisors (1).

90566389 is an equidigital number, since it uses as much as digits as its factorization.

90566389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 90566389 is about 9516.6374839015. The cubic root of 90566389 is about 449.0785903507.

The spelling of 90566389 in words is "ninety million, five hundred sixty-six thousand, three hundred eighty-nine".