170990321 has 2 divisors, whose sum is σ = 170990322. Its totient is φ = 170990320.

The previous prime is 170990311. The next prime is 170990341. The reversal of 170990321 is 123099071.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164839921 + 6150400 = 12839^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 170990321 - 2²² = 166796017 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 (170990311) 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 as a sum of consecutive naturals, namely, 85495160 + 85495161.

It is an arithmetic number, because the mean of its divisors is an integer number (85495161).

Almost surely, 2^170990321 is an apocalyptic number.

It is an amenable number.

170990321 is a deficient number, since it is larger than the sum of its proper divisors (1).

170990321 is an equidigital number, since it uses as much as digits as its factorization.

170990321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 170990321 is about 13076.3267395703. The cubic root of 170990321 is about 555.0394377191.

The spelling of 170990321 in words is "one hundred seventy million, nine hundred ninety thousand, three hundred twenty-one".