13406181 has 4 divisors (see below), whose sum is σ = 17874912. Its totient is φ = 8937452.

The previous prime is 13406179. The next prime is 13406189. The reversal of 13406181 is 18160431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18160431 = 3 ⋅6053477.

It is a cyclic number.

It is not a de Polignac number, because 13406181 - 2¹ = 13406179 is a prime.

It is a super-2 number, since 2×13406181² = 359451378009522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13406189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234361 + ... + 2234366.

It is an arithmetic number, because the mean of its divisors is an integer number (4468728).

Almost surely, 2^13406181 is an apocalyptic number.

It is an amenable number.

13406181 is a deficient number, since it is larger than the sum of its proper divisors (4468731).

13406181 is an equidigital number, since it uses as much as digits as its factorization.

13406181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468730.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 13406181 is about 3661.4452064724. The cubic root of 13406181 is about 237.5572884885.

The spelling of 13406181 in words is "thirteen million, four hundred six thousand, one hundred eighty-one".