916352221 has 2 divisors, whose sum is σ = 916352222. Its totient is φ = 916352220.

The previous prime is 916352161. The next prime is 916352243. The reversal of 916352221 is 122253619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 915728121 + 624100 = 30261^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 916352221 - 2¹³ = 916344029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (916355221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458176110 + 458176111.

It is an arithmetic number, because the mean of its divisors is an integer number (458176111).

Almost surely, 2^916352221 is an apocalyptic number.

It is an amenable number.

916352221 is a deficient number, since it is larger than the sum of its proper divisors (1).

916352221 is an equidigital number, since it uses as much as digits as its factorization.

916352221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 916352221 is about 30271.3101962898. The cubic root of 916352221 is about 971.3016927335.

The spelling of 916352221 in words is "nine hundred sixteen million, three hundred fifty-two thousand, two hundred twenty-one".