913403221 has 2 divisors, whose sum is σ = 913403222. Its totient is φ = 913403220.

The previous prime is 913403213. The next prime is 913403273. The reversal of 913403221 is 122304319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 727380900 + 186022321 = 26970^2 + 13639^2 .

It is an emirp because it is prime and its reverse (122304319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 913403221 - 2³ = 913403213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (913403021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456701610 + 456701611.

It is an arithmetic number, because the mean of its divisors is an integer number (456701611).

Almost surely, 2^913403221 is an apocalyptic number.

It is an amenable number.

913403221 is a deficient number, since it is larger than the sum of its proper divisors (1).

913403221 is an equidigital number, since it uses as much as digits as its factorization.

913403221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 913403221 is about 30222.5614566337. The cubic root of 913403221 is about 970.2586269667.

The spelling of 913403221 in words is "nine hundred thirteen million, four hundred three thousand, two hundred twenty-one".