18226851 has 4 divisors (see below), whose sum is σ = 24302472. Its totient is φ = 12151232.

The previous prime is 18226847. The next prime is 18226927. The reversal of 18226851 is 15862281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15862281 = 3 ⋅5287427.

It is a cyclic number.

It is not a de Polignac number, because 18226851 - 2² = 18226847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18226951) 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, 3037806 + ... + 3037811.

It is an arithmetic number, because the mean of its divisors is an integer number (6075618).

Almost surely, 2^18226851 is an apocalyptic number.

18226851 is a deficient number, since it is larger than the sum of its proper divisors (6075621).

18226851 is an equidigital number, since it uses as much as digits as its factorization.

18226851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6075620.

The product of its digits is 7680, while the sum is 33.

The square root of 18226851 is about 4269.2916274249. The cubic root of 18226851 is about 263.1705053669.

The spelling of 18226851 in words is "eighteen million, two hundred twenty-six thousand, eight hundred fifty-one".