315422221 has 2 divisors, whose sum is σ = 315422222. Its totient is φ = 315422220.

The previous prime is 315422209. The next prime is 315422251. The reversal of 315422221 is 122224513.

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., 305725225 + 9696996 = 17485^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 315422221 - 2²³ = 307033613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 315422192 and 315422201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315422251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157711110 + 157711111.

It is an arithmetic number, because the mean of its divisors is an integer number (157711111).

Almost surely, 2^315422221 is an apocalyptic number.

It is an amenable number.

315422221 is a deficient number, since it is larger than the sum of its proper divisors (1).

315422221 is an equidigital number, since it uses as much as digits as its factorization.

315422221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 22.

The square root of 315422221 is about 17760.1300952442. The cubic root of 315422221 is about 680.7130791050.

Adding to 315422221 its reverse (122224513), we get a palindrome (437646734).

The spelling of 315422221 in words is "three hundred fifteen million, four hundred twenty-two thousand, two hundred twenty-one".