90668321 has 2 divisors, whose sum is σ = 90668322. Its totient is φ = 90668320.

The previous prime is 90668317. The next prime is 90668329. The reversal of 90668321 is 12386609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49900096 + 40768225 = 7064^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 90668321 - 2² = 90668317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90668329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45334160 + 45334161.

It is an arithmetic number, because the mean of its divisors is an integer number (45334161).

Almost surely, 2^90668321 is an apocalyptic number.

It is an amenable number.

90668321 is a deficient number, since it is larger than the sum of its proper divisors (1).

90668321 is an equidigital number, since it uses as much as digits as its factorization.

90668321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 90668321 is about 9521.9914408699. The cubic root of 90668321 is about 449.2470057225.

The spelling of 90668321 in words is "ninety million, six hundred sixty-eight thousand, three hundred twenty-one".