18161353 has 4 divisors (see below), whose sum is σ = 20755840. Its totient is φ = 15566868.

The previous prime is 18161327. The next prime is 18161357. The reversal of 18161353 is 35316181.

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: 35316181 = 71 ⋅497411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18161353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18161357) 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, 1297233 + ... + 1297246.

It is an arithmetic number, because the mean of its divisors is an integer number (5188960).

Almost surely, 2^18161353 is an apocalyptic number.

It is an amenable number.

18161353 is a deficient number, since it is larger than the sum of its proper divisors (2594487).

18161353 is an equidigital number, since it uses as much as digits as its factorization.

18161353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594486.

The product of its digits is 2160, while the sum is 28.

The square root of 18161353 is about 4261.6138961666. The cubic root of 18161353 is about 262.8548935215.

The spelling of 18161353 in words is "eighteen million, one hundred sixty-one thousand, three hundred fifty-three".