90117321 has 24 divisors (see below), whose sum is σ = 140668704. Its totient is φ = 51166080.

The previous prime is 90117319. The next prime is 90117329. The reversal of 90117321 is 12371109.

It is not a de Polignac number, because 90117321 - 2¹ = 90117319 is a prime.

It is a super-2 number, since 2×90117321² = 16242263088434082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90117291 and 90117300.

It is not an unprimeable number, because it can be changed into a prime (90117329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22081 + ... + 25841.

It is an arithmetic number, because the mean of its divisors is an integer number (5861196).

Almost surely, 2^90117321 is an apocalyptic number.

It is an amenable number.

90117321 is a deficient number, since it is larger than the sum of its proper divisors (50551383).

90117321 is a wasteful number, since it uses less digits than its factorization.

90117321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941 (or 3934 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 90117321 is about 9493.0143263349. The cubic root of 90117321 is about 448.3351170986.

The spelling of 90117321 in words is "ninety million, one hundred seventeen thousand, three hundred twenty-one".