90844321 has 2 divisors, whose sum is σ = 90844322. Its totient is φ = 90844320.

The previous prime is 90844261. The next prime is 90844331. The reversal of 90844321 is 12344809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58354321 + 32490000 = 7639^2 + 5700^2 .

It is an emirp because it is prime and its reverse (12344809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90844321 - 2¹³ = 90836129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90844331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45422160 + 45422161.

It is an arithmetic number, because the mean of its divisors is an integer number (45422161).

Almost surely, 2^90844321 is an apocalyptic number.

It is an amenable number.

90844321 is a deficient number, since it is larger than the sum of its proper divisors (1).

90844321 is an equidigital number, since it uses as much as digits as its factorization.

90844321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 90844321 is about 9531.2287245664. The cubic root of 90844321 is about 449.5375017740.

The spelling of 90844321 in words is "ninety million, eight hundred forty-four thousand, three hundred twenty-one".