13661091 has 12 divisors (see below), whose sum is σ = 19767280. Its totient is φ = 9091440.

The previous prime is 13661083. The next prime is 13661191. The reversal of 13661091 is 19016631.

13661091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13661091 - 2³ = 13661083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13661071) 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, 6546 + ... + 8376.

Almost surely, 2^13661091 is an apocalyptic number.

13661091 is a deficient number, since it is larger than the sum of its proper divisors (6106189).

13661091 is a wasteful number, since it uses less digits than its factorization.

13661091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666 (or 2663 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 13661091 is about 3696.0913138071. The cubic root of 13661091 is about 239.0535118241.

The spelling of 13661091 in words is "thirteen million, six hundred sixty-one thousand, ninety-one".