1309791249 has 32 divisors (see below), whose sum is σ = 2108252160. Its totient is φ = 798868224.

The previous prime is 1309791233. The next prime is 1309791269. The reversal of 1309791249 is 9421979031.

It is not a de Polignac number, because 1309791249 - 2⁴ = 1309791233 is a prime.

It is a super-3 number, since 3×1309791249³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1309791269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23152 + ... + 56174.

It is an arithmetic number, because the mean of its divisors is an integer number (65882880).

Almost surely, 2^1309791249 is an apocalyptic number.

It is an amenable number.

1309791249 is a deficient number, since it is larger than the sum of its proper divisors (798460911).

1309791249 is a wasteful number, since it uses less digits than its factorization.

1309791249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33158 (or 33152 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 1309791249 is about 36191.0382415316. The cubic root of 1309791249 is about 1094.1260581636.

The spelling of 1309791249 in words is "one billion, three hundred nine million, seven hundred ninety-one thousand, two hundred forty-nine".