313221343 has 2 divisors, whose sum is σ = 313221344. Its totient is φ = 313221342.

The previous prime is 313221313. The next prime is 313221347. The reversal of 313221343 is 343122313.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313221343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313221347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156610671 + 156610672.

It is an arithmetic number, because the mean of its divisors is an integer number (156610672).

Almost surely, 2^313221343 is an apocalyptic number.

313221343 is a deficient number, since it is larger than the sum of its proper divisors (1).

313221343 is an equidigital number, since it uses as much as digits as its factorization.

313221343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 22.

The square root of 313221343 is about 17698.0604304540. The cubic root of 313221343 is about 679.1261432172.

Adding to 313221343 its reverse (343122313), we get a palindrome (656343656).

The spelling of 313221343 in words is "three hundred thirteen million, two hundred twenty-one thousand, three hundred forty-three".