90813289 has 4 divisors (see below), whose sum is σ = 103786624. Its totient is φ = 77839956.

The previous prime is 90813277. The next prime is 90813301. The reversal of 90813289 is 98231809.

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 an interprime number because it is at equal distance from previous prime (90813277) and next prime (90813301).

It is a cyclic number.

It is not a de Polignac number, because 90813289 - 2⁷ = 90813161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90813089) 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, 6486657 + ... + 6486670.

It is an arithmetic number, because the mean of its divisors is an integer number (25946656).

Almost surely, 2^90813289 is an apocalyptic number.

It is an amenable number.

90813289 is a deficient number, since it is larger than the sum of its proper divisors (12973335).

90813289 is a wasteful number, since it uses less digits than its factorization.

90813289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12973334.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 90813289 is about 9529.6006736904. The cubic root of 90813289 is about 449.4863093005.

The spelling of 90813289 in words is "ninety million, eight hundred thirteen thousand, two hundred eighty-nine".