1309103849 has 4 divisors (see below), whose sum is σ = 1309208964. Its totient is φ = 1308998736.

The previous prime is 1309103839. The next prime is 1309103879. The reversal of 1309103849 is 9483019031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9483019031 = 2971 ⋅3191861.

It can be written as a sum of positive squares in 2 ways, for example, as 253828624 + 1055275225 = 15932^2 + 32485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1309103849 is a prime.

It is a super-2 number, since 2×1309103849² = 3427505774933229602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309103839) 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, 30902 + ... + 59775.

It is an arithmetic number, because the mean of its divisors is an integer number (327302241).

Almost surely, 2^1309103849 is an apocalyptic number.

It is an amenable number.

1309103849 is a deficient number, since it is larger than the sum of its proper divisors (105115).

1309103849 is an equidigital number, since it uses as much as digits as its factorization.

1309103849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105114.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1309103849 is about 36181.5401689867. The cubic root of 1309103849 is about 1093.9346195499.

The spelling of 1309103849 in words is "one billion, three hundred nine million, one hundred three thousand, eight hundred forty-nine".