13812161 has 4 divisors (see below), whose sum is σ = 15067824. Its totient is φ = 12556500.

The previous prime is 13812157. The next prime is 13812163. The reversal of 13812161 is 16121831.

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.

It is not a de Polignac number, because 13812161 - 2² = 13812157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13812163) 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, 627815 + ... + 627836.

It is an arithmetic number, because the mean of its divisors is an integer number (3766956).

Almost surely, 2^13812161 is an apocalyptic number.

13812161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13812161 is a deficient number, since it is larger than the sum of its proper divisors (1255663).

13812161 is a wasteful number, since it uses less digits than its factorization.

13812161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255662.

The product of its digits is 288, while the sum is 23.

The square root of 13812161 is about 3716.4715793344. The cubic root of 13812161 is about 239.9314677009.

Adding to 13812161 its reverse (16121831), we get a palindrome (29933992).

The spelling of 13812161 in words is "thirteen million, eight hundred twelve thousand, one hundred sixty-one".