1309509077 has 4 divisors (see below), whose sum is σ = 1311632076. Its totient is φ = 1307386080.

The previous prime is 1309509073. The next prime is 1309509079. The reversal of 1309509077 is 7709059031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7709059031 = 19 ⋅405739949.

It can be written as a sum of positive squares in 2 ways, for example, as 639786436 + 669722641 = 25294^2 + 25879^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309509077 - 2² = 1309509073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309509073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060574 + ... + 1061807.

It is an arithmetic number, because the mean of its divisors is an integer number (327908019).

Almost surely, 2^1309509077 is an apocalyptic number.

It is an amenable number.

1309509077 is a deficient number, since it is larger than the sum of its proper divisors (2122999).

1309509077 is an equidigital number, since it uses as much as digits as its factorization.

1309509077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122998.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 1309509077 is about 36187.1396631455. The cubic root of 1309509077 is about 1094.0474823062.

The spelling of 1309509077 in words is "one billion, three hundred nine million, five hundred nine thousand, seventy-seven".