326221913 has 2 divisors, whose sum is σ = 326221914. Its totient is φ = 326221912.

The previous prime is 326221879. The next prime is 326221937. The reversal of 326221913 is 319122623.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 297631504 + 28590409 = 17252^2 + 5347^2 .

It is a cyclic number.

It is not a de Polignac number, because 326221913 - 2¹² = 326217817 is a prime.

It is not a weakly prime, because it can be changed into another prime (326221813) 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, 163110956 + 163110957.

It is an arithmetic number, because the mean of its divisors is an integer number (163110957).

Almost surely, 2^326221913 is an apocalyptic number.

It is an amenable number.

326221913 is a deficient number, since it is larger than the sum of its proper divisors (1).

326221913 is an equidigital number, since it uses as much as digits as its factorization.

326221913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 29.

The square root of 326221913 is about 18061.6143519897. The cubic root of 326221913 is about 688.3950044052.

The spelling of 326221913 in words is "three hundred twenty-six million, two hundred twenty-one thousand, nine hundred thirteen".