1311032909 has 2 divisors, whose sum is σ = 1311032910. Its totient is φ = 1311032908.

The previous prime is 1311032903. The next prime is 1311032969. The reversal of 1311032909 is 9092301131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1249410409 + 61622500 = 35347^2 + 7850^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311032909 - 2¹² = 1311028813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311032903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655516454 + 655516455.

It is an arithmetic number, because the mean of its divisors is an integer number (655516455).

Almost surely, 2^1311032909 is an apocalyptic number.

It is an amenable number.

1311032909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311032909 is an equidigital number, since it uses as much as digits as its factorization.

1311032909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1311032909 is about 36208.1884247196. The cubic root of 1311032909 is about 1094.4716866495.

The spelling of 1311032909 in words is "one billion, three hundred eleven million, thirty-two thousand, nine hundred nine".