18198151 has 4 divisors (see below), whose sum is σ = 18273904. Its totient is φ = 18122400.

The previous prime is 18198149. The next prime is 18198161. The reversal of 18198151 is 15189181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15189181 = 7 ⋅2169883.

It is a cyclic number.

It is not a de Polignac number, because 18198151 - 2¹ = 18198149 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 (18198161) 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, 37515 + ... + 37996.

It is an arithmetic number, because the mean of its divisors is an integer number (4568476).

Almost surely, 2^18198151 is an apocalyptic number.

18198151 is a deficient number, since it is larger than the sum of its proper divisors (75753).

18198151 is an equidigital number, since it uses as much as digits as its factorization.

18198151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75752.

The product of its digits is 2880, while the sum is 34.

The square root of 18198151 is about 4265.9290898935. The cubic root of 18198151 is about 263.0323033760.

The spelling of 18198151 in words is "eighteen million, one hundred ninety-eight thousand, one hundred fifty-one".