13163861 has 4 divisors (see below), whose sum is σ = 13379724. Its totient is φ = 12948000.

The previous prime is 13163851. The next prime is 13163863. The reversal of 13163861 is 16836131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3591025 + 9572836 = 1895^2 + 3094^2 .

It is a cyclic number.

It is not a de Polignac number, because 13163861 - 2¹⁸ = 12901717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13163863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107840 + ... + 107961.

It is an arithmetic number, because the mean of its divisors is an integer number (3344931).

Almost surely, 2^13163861 is an apocalyptic number.

It is an amenable number.

13163861 is a deficient number, since it is larger than the sum of its proper divisors (215863).

13163861 is an equidigital number, since it uses as much as digits as its factorization.

13163861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215862.

The product of its digits is 2592, while the sum is 29.

The square root of 13163861 is about 3628.2035499679. The cubic root of 13163861 is about 236.1172750942.

Adding to 13163861 its reverse (16836131), we get a palindrome (29999992).

The spelling of 13163861 in words is "thirteen million, one hundred sixty-three thousand, eight hundred sixty-one".