90581573 has 2 divisors, whose sum is σ = 90581574. Its totient is φ = 90581572.

The previous prime is 90581563. The next prime is 90581609. The reversal of 90581573 is 37518509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70930084 + 19651489 = 8422^2 + 4433^2 .

It is a cyclic number.

It is not a de Polignac number, because 90581573 - 2⁸ = 90581317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90581563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45290786 + 45290787.

It is an arithmetic number, because the mean of its divisors is an integer number (45290787).

Almost surely, 2^90581573 is an apocalyptic number.

It is an amenable number.

90581573 is a deficient number, since it is larger than the sum of its proper divisors (1).

90581573 is an equidigital number, since it uses as much as digits as its factorization.

90581573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 90581573 is about 9517.4352112321. The cubic root of 90581573 is about 449.1036858574.

The spelling of 90581573 in words is "ninety million, five hundred eighty-one thousand, five hundred seventy-three".