1308113309 has 4 divisors (see below), whose sum is σ = 1308190140. Its totient is φ = 1308036480.

The previous prime is 1308113243. The next prime is 1308113321. The reversal of 1308113309 is 9033118031.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 468852409 + 839260900 = 21653^2 + 28970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1308113309 - 2¹² = 1308109213 is a prime.

It is a super-2 number, since 2×1308113309² = 3422320858365858962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1308113329) 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, 212 + ... + 51149.

It is an arithmetic number, because the mean of its divisors is an integer number (327047535).

Almost surely, 2^1308113309 is an apocalyptic number.

It is an amenable number.

1308113309 is a deficient number, since it is larger than the sum of its proper divisors (76831).

1308113309 is an equidigital number, since it uses as much as digits as its factorization.

1308113309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76830.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1308113309 is about 36167.8491066306. The cubic root of 1308113309 is about 1093.6586395569.

The spelling of 1308113309 in words is "one billion, three hundred eight million, one hundred thirteen thousand, three hundred nine".