1310720809 has 2 divisors, whose sum is σ = 1310720810. Its totient is φ = 1310720808.

The previous prime is 1310720783. The next prime is 1310720839. The reversal of 1310720809 is 9080270131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1011430809 + 299290000 = 31803^2 + 17300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1310720809 - 2¹⁷ = 1310589737 is a prime.

It is a super-2 number, since 2×1310720809² = 3435978078291228962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1310720839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655360404 + 655360405.

It is an arithmetic number, because the mean of its divisors is an integer number (655360405).

Almost surely, 2^1310720809 is an apocalyptic number.

It is an amenable number.

1310720809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1310720809 is an equidigital number, since it uses as much as digits as its factorization.

1310720809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1310720809 is about 36203.8783695891. The cubic root of 1310720809 is about 1094.3848310310.

The spelling of 1310720809 in words is "one billion, three hundred ten million, seven hundred twenty thousand, eight hundred nine".