90009321 has 4 divisors (see below), whose sum is σ = 120012432. Its totient is φ = 60006212.

The previous prime is 90009313. The next prime is 90009329. The reversal of 90009321 is 12390009.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12390009 = 3 ⋅4130003.

It is an interprime number because it is at equal distance from previous prime (90009313) and next prime (90009329).

It is a cyclic number.

It is not a de Polignac number, because 90009321 - 2³ = 90009313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90009291 and 90009300.

It is not an unprimeable number, because it can be changed into a prime (90009329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15001551 + ... + 15001556.

It is an arithmetic number, because the mean of its divisors is an integer number (30003108).

Almost surely, 2^90009321 is an apocalyptic number.

It is an amenable number.

90009321 is a deficient number, since it is larger than the sum of its proper divisors (30003111).

90009321 is a wasteful number, since it uses less digits than its factorization.

90009321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30003110.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 90009321 is about 9487.3242276208. The cubic root of 90009321 is about 448.1559449267.

The spelling of 90009321 in words is "ninety million, nine thousand, three hundred twenty-one".