90245409 has 4 divisors (see below), whose sum is σ = 120327216. Its totient is φ = 60163604.

The previous prime is 90245369. The next prime is 90245411. The reversal of 90245409 is 90454209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90245409 - 2²¹ = 88148257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90245409.

It is not an unprimeable number, because it can be changed into a prime (90245429) 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, 15040899 + ... + 15040904.

It is an arithmetic number, because the mean of its divisors is an integer number (30081804).

Almost surely, 2^90245409 is an apocalyptic number.

It is an amenable number.

90245409 is a deficient number, since it is larger than the sum of its proper divisors (30081807).

90245409 is a wasteful number, since it uses less digits than its factorization.

90245409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30081806.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 90245409 is about 9499.7583653480. The cubic root of 90245409 is about 448.5474298250.

The spelling of 90245409 in words is "ninety million, two hundred forty-five thousand, four hundred nine".