90321817 has 4 divisors (see below), whose sum is σ = 93235456. Its totient is φ = 87408180.

The previous prime is 90321797. The next prime is 90321821. The reversal of 90321817 is 71812309.

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 a cyclic number.

It is not a de Polignac number, because 90321817 - 2¹⁵ = 90289049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2913607 = 90321817 / (9 + 0 + 3 + 2 + 1 + 8 + 1 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90321317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1456773 + ... + 1456834.

It is an arithmetic number, because the mean of its divisors is an integer number (23308864).

Almost surely, 2^90321817 is an apocalyptic number.

It is an amenable number.

90321817 is a deficient number, since it is larger than the sum of its proper divisors (2913639).

90321817 is a wasteful number, since it uses less digits than its factorization.

90321817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913638.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 90321817 is about 9503.7790904461. The cubic root of 90321817 is about 448.6739845326.

The spelling of 90321817 in words is "ninety million, three hundred twenty-one thousand, eight hundred seventeen".