18497851 has 2 divisors, whose sum is σ = 18497852. Its totient is φ = 18497850.

The previous prime is 18497833. The next prime is 18497861. The reversal of 18497851 is 15879481.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18497851 - 2⁷ = 18497723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18497798 and 18497807.

It is not a weakly prime, because it can be changed into another prime (18497821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9248925 + 9248926.

It is an arithmetic number, because the mean of its divisors is an integer number (9248926).

Almost surely, 2^18497851 is an apocalyptic number.

18497851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18497851 is an equidigital number, since it uses as much as digits as its factorization.

18497851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 18497851 is about 4300.9128100904. The cubic root of 18497851 is about 264.4683824352.

The spelling of 18497851 in words is "eighteen million, four hundred ninety-seven thousand, eight hundred fifty-one".