18148551 has 4 divisors (see below), whose sum is σ = 24198072. Its totient is φ = 12099032.

The previous prime is 18148549. The next prime is 18148561. The reversal of 18148551 is 15584181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15584181 = 3 ⋅5194727.

It is a cyclic number.

It is not a de Polignac number, because 18148551 - 2¹ = 18148549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18148511) 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, 3024756 + ... + 3024761.

It is an arithmetic number, because the mean of its divisors is an integer number (6049518).

Almost surely, 2^18148551 is an apocalyptic number.

18148551 is a deficient number, since it is larger than the sum of its proper divisors (6049521).

18148551 is an equidigital number, since it uses as much as digits as its factorization.

18148551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6049520.

The product of its digits is 6400, while the sum is 33.

The square root of 18148551 is about 4260.1116182560. Note that the first 3 decimals coincide. The cubic root of 18148551 is about 262.7931165650.

The spelling of 18148551 in words is "eighteen million, one hundred forty-eight thousand, five hundred fifty-one".