90918489 has 4 divisors (see below), whose sum is σ = 121224656. Its totient is φ = 60612324.

The previous prime is 90918481. The next prime is 90918491. The reversal of 90918489 is 98481909.

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 not a de Polignac number, because 90918489 - 2³ = 90918481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90918481) 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, 15153079 + ... + 15153084.

It is an arithmetic number, because the mean of its divisors is an integer number (30306164).

Almost surely, 2^90918489 is an apocalyptic number.

It is an amenable number.

90918489 is a deficient number, since it is larger than the sum of its proper divisors (30306167).

90918489 is a wasteful number, since it uses less digits than its factorization.

90918489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30306166.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 90918489 is about 9535.1187197643. The cubic root of 90918489 is about 449.6598070818.

The spelling of 90918489 in words is "ninety million, nine hundred eighteen thousand, four hundred eighty-nine".