1313223281 has 2 divisors, whose sum is σ = 1313223282. Its totient is φ = 1313223280.

The previous prime is 1313223221. The next prime is 1313223319. The reversal of 1313223281 is 1823223131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311091681 + 2131600 = 36209^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313223281 - 2¹⁴ = 1313206897 is a prime.

It is a super-2 number, since 2×1313223281² = 3449110771520809922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1313223281.

It is not a weakly prime, because it can be changed into another prime (1313223221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656611640 + 656611641.

It is an arithmetic number, because the mean of its divisors is an integer number (656611641).

Almost surely, 2^1313223281 is an apocalyptic number.

It is an amenable number.

1313223281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313223281 is an equidigital number, since it uses as much as digits as its factorization.

1313223281 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 1313223281 is about 36238.4227167795. The cubic root of 1313223281 is about 1095.0808669592.

The spelling of 1313223281 in words is "one billion, three hundred thirteen million, two hundred twenty-three thousand, two hundred eighty-one".