319242221 has 2 divisors, whose sum is σ = 319242222. Its totient is φ = 319242220.

The previous prime is 319242211. The next prime is 319242227. The reversal of 319242221 is 122242913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 270438025 + 48804196 = 16445^2 + 6986^2 .

It is a cyclic number.

It is not a de Polignac number, because 319242221 - 2²² = 315047917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319242227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159621110 + 159621111.

It is an arithmetic number, because the mean of its divisors is an integer number (159621111).

Almost surely, 2^319242221 is an apocalyptic number.

It is an amenable number.

319242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

319242221 is an equidigital number, since it uses as much as digits as its factorization.

319242221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 319242221 is about 17867.3506989705. The cubic root of 319242221 is about 683.4500419866.

The spelling of 319242221 in words is "three hundred nineteen million, two hundred forty-two thousand, two hundred twenty-one".