1309008981 has 12 divisors (see below), whose sum is σ = 2030299872. Its totient is φ = 748005048.

The previous prime is 1309008973. The next prime is 1309008983. The reversal of 1309008981 is 1898009031.

It is a happy number.

It is not a de Polignac number, because 1309008981 - 2³ = 1309008973 is a prime.

It is a super-2 number, since 2×1309008981² = 3427009024677316722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309008983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4452265 + ... + 4452558.

It is an arithmetic number, because the mean of its divisors is an integer number (169191656).

Almost surely, 2^1309008981 is an apocalyptic number.

It is an amenable number.

1309008981 is a deficient number, since it is larger than the sum of its proper divisors (721290891).

1309008981 is an equidigital number, since it uses as much as digits as its factorization.

1309008981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8904840 (or 8904833 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 1309008981 is about 36180.2291452113. The cubic root of 1309008981 is about 1093.9081938653.

The spelling of 1309008981 in words is "one billion, three hundred nine million, eight thousand, nine hundred eighty-one".