1311623009 has 2 divisors, whose sum is σ = 1311623010. Its totient is φ = 1311623008.

The previous prime is 1311623003. The next prime is 1311623069. The reversal of 1311623009 is 9003261131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1306461025 + 5161984 = 36145^2 + 2272^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311623009 - 2¹⁶ = 1311557473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1311623003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655811504 + 655811505.

It is an arithmetic number, because the mean of its divisors is an integer number (655811505).

Almost surely, 2^1311623009 is an apocalyptic number.

It is an amenable number.

1311623009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311623009 is an equidigital number, since it uses as much as digits as its factorization.

1311623009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1311623009 is about 36216.3362172377. The cubic root of 1311623009 is about 1094.6358703916.

The spelling of 1311623009 in words is "one billion, three hundred eleven million, six hundred twenty-three thousand, nine".