18129851 has 2 divisors, whose sum is σ = 18129852. Its totient is φ = 18129850.

The previous prime is 18129847. The next prime is 18129883. The reversal of 18129851 is 15892181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18129851 - 2² = 18129847 is a prime.

It is not a weakly prime, because it can be changed into another prime (18129151) 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 as a sum of consecutive naturals, namely, 9064925 + 9064926.

It is an arithmetic number, because the mean of its divisors is an integer number (9064926).

Almost surely, 2^18129851 is an apocalyptic number.

18129851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18129851 is an equidigital number, since it uses as much as digits as its factorization.

18129851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 35.

The square root of 18129851 is about 4257.9162744234. The cubic root of 18129851 is about 262.7028261593.

Subtracting from 18129851 its reverse (15892181), we obtain a triangular number (2237670 = T₂₁₁₅).

The spelling of 18129851 in words is "eighteen million, one hundred twenty-nine thousand, eight hundred fifty-one".