90312321 has 8 divisors (see below), whose sum is σ = 131363424. Its totient is φ = 54734720.

The previous prime is 90312319. The next prime is 90312323. The reversal of 90312321 is 12321309.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90312319) and next prime (90312323).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90312321 - 2¹ = 90312319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90312323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1368336 + ... + 1368401.

It is an arithmetic number, because the mean of its divisors is an integer number (16420428).

Almost surely, 2^90312321 is an apocalyptic number.

It is an amenable number.

90312321 is a deficient number, since it is larger than the sum of its proper divisors (41051103).

90312321 is a wasteful number, since it uses less digits than its factorization.

90312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736751.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 90312321 is about 9503.2794865773. The cubic root of 90312321 is about 448.6582601757.

The spelling of 90312321 in words is "ninety million, three hundred twelve thousand, three hundred twenty-one".