90544609 has 2 divisors, whose sum is σ = 90544610. Its totient is φ = 90544608.

The previous prime is 90544589. The next prime is 90544637. The reversal of 90544609 is 90644509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56205009 + 34339600 = 7497^2 + 5860^2 .

It is a cyclic number.

It is not a de Polignac number, because 90544609 - 2¹³ = 90536417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90544639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45272304 + 45272305.

It is an arithmetic number, because the mean of its divisors is an integer number (45272305).

Almost surely, 2^90544609 is an apocalyptic number.

It is an amenable number.

90544609 is a deficient number, since it is larger than the sum of its proper divisors (1).

90544609 is an equidigital number, since it uses as much as digits as its factorization.

90544609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 90544609 is about 9515.4931033552. The cubic root of 90544609 is about 449.0425883416.

The spelling of 90544609 in words is "ninety million, five hundred forty-four thousand, six hundred nine".