1309090909 has 24 divisors (see below), whose sum is σ = 1591987200. Its totient is φ = 1072038240.

The previous prime is 1309090897. The next prime is 1309090961. The reversal of 1309090909 is 9090909031.

It is not a de Polignac number, because 1309090909 - 2⁵ = 1309090877 is a prime.

It is a Duffinian number.

1309090909 is a modest number, since divided by 90909 gives 1309 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309091909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114547 + ... + 125455.

It is an arithmetic number, because the mean of its divisors is an integer number (66332800).

Almost surely, 2^1309090909 is an apocalyptic number.

It is an amenable number.

1309090909 is a deficient number, since it is larger than the sum of its proper divisors (282896291).

1309090909 is a wasteful number, since it uses less digits than its factorization.

1309090909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11033 (or 11026 counting only the distinct ones).

The product of its (nonzero) digits is 19683, while the sum is 40.

The square root of 1309090909 is about 36181.3613480753. The cubic root of 1309090909 is about 1093.9310151604.

The spelling of 1309090909 in words is "one billion, three hundred nine million, ninety thousand, nine hundred nine".