90386321 has 2 divisors, whose sum is σ = 90386322. Its totient is φ = 90386320.

The previous prime is 90386299. The next prime is 90386341. The reversal of 90386321 is 12368309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89567296 + 819025 = 9464^2 + 905^2 .

It is an emirp because it is prime and its reverse (12368309) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90386321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90386341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45193160 + 45193161.

It is an arithmetic number, because the mean of its divisors is an integer number (45193161).

Almost surely, 2^90386321 is an apocalyptic number.

It is an amenable number.

90386321 is a deficient number, since it is larger than the sum of its proper divisors (1).

90386321 is an equidigital number, since it uses as much as digits as its factorization.

90386321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 90386321 is about 9507.1720821704. The cubic root of 90386321 is about 448.7807670755.

The spelling of 90386321 in words is "ninety million, three hundred eighty-six thousand, three hundred twenty-one".