1313211209 has 2 divisors, whose sum is σ = 1313211210. Its totient is φ = 1313211208.

The previous prime is 1313211187. The next prime is 1313211217. The reversal of 1313211209 is 9021123131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1239251209 + 73960000 = 35203^2 + 8600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313211209 - 2²⁴ = 1296433993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1313211269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656605604 + 656605605.

It is an arithmetic number, because the mean of its divisors is an integer number (656605605).

Almost surely, 2^1313211209 is an apocalyptic number.

It is an amenable number.

1313211209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313211209 is an equidigital number, since it uses as much as digits as its factorization.

1313211209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1313211209 is about 36238.2561528559. The cubic root of 1313211209 is about 1095.0775113844.

The spelling of 1313211209 in words is "one billion, three hundred thirteen million, two hundred eleven thousand, two hundred nine".