12591081 has 6 divisors (see below), whose sum is σ = 18187130. Its totient is φ = 8394048.

The previous prime is 12591043. The next prime is 12591149. The reversal of 12591081 is 18019521.

12591081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9511056 + 3080025 = 3084^2 + 1755^2 .

It is not a de Polignac number, because 12591081 - 2⁹ = 12590569 is a prime.

It is a super-2 number, since 2×12591081² = 317070641497122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12591031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 699496 + ... + 699513.

Almost surely, 2^12591081 is an apocalyptic number.

It is an amenable number.

12591081 is a deficient number, since it is larger than the sum of its proper divisors (5596049).

12591081 is a wasteful number, since it uses less digits than its factorization.

12591081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399015 (or 1399012 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 12591081 is about 3548.3913256573. The cubic root of 12591081 is about 232.6417588499.

The spelling of 12591081 in words is "twelve million, five hundred ninety-one thousand, eighty-one".