18161349 has 4 divisors (see below), whose sum is σ = 24215136. Its totient is φ = 12107564.

The previous prime is 18161327. The next prime is 18161357. The reversal of 18161349 is 94316181.

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: 94316181 = 3 ⋅31438727.

It is a cyclic number.

It is not a de Polignac number, because 18161349 - 2⁹ = 18160837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161309) 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, 3026889 + ... + 3026894.

It is an arithmetic number, because the mean of its divisors is an integer number (6053784).

Almost surely, 2^18161349 is an apocalyptic number.

It is an amenable number.

18161349 is a deficient number, since it is larger than the sum of its proper divisors (6053787).

18161349 is an equidigital number, since it uses as much as digits as its factorization.

18161349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6053786.

The product of its digits is 5184, while the sum is 33.

The square root of 18161349 is about 4261.6134268608. The cubic root of 18161349 is about 262.8548742237.

The spelling of 18161349 in words is "eighteen million, one hundred sixty-one thousand, three hundred forty-nine".