90418609 has 4 divisors (see below), whose sum is σ = 90438516. Its totient is φ = 90398704.

The previous prime is 90418567. The next prime is 90418633. The reversal of 90418609 is 90681409.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66064384 + 24354225 = 8128^2 + 4935^2 .

It is a cyclic number.

It is not a de Polignac number, because 90418609 - 2⁷ = 90418481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90418109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567 + ... + 13459.

It is an arithmetic number, because the mean of its divisors is an integer number (22609629).

Almost surely, 2^90418609 is an apocalyptic number.

It is an amenable number.

90418609 is a deficient number, since it is larger than the sum of its proper divisors (19907).

90418609 is a wasteful number, since it uses less digits than its factorization.

90418609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19906.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 90418609 is about 9508.8700169894. The cubic root of 90418609 is about 448.8341988639.

The spelling of 90418609 in words is "ninety million, four hundred eighteen thousand, six hundred nine".