18444851 has 2 divisors, whose sum is σ = 18444852. Its totient is φ = 18444850.

The previous prime is 18444823. The next prime is 18444887. The reversal of 18444851 is 15844481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18444851 - 2⁶ = 18444787 is a prime.

It is not a weakly prime, because it can be changed into another prime (18441851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9222425 + 9222426.

It is an arithmetic number, because the mean of its divisors is an integer number (9222426).

Almost surely, 2^18444851 is an apocalyptic number.

18444851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18444851 is an equidigital number, since it uses as much as digits as its factorization.

18444851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20480, while the sum is 35.

The square root of 18444851 is about 4294.7469075604. The cubic root of 18444851 is about 264.2155560824.

The spelling of 18444851 in words is "eighteen million, four hundred forty-four thousand, eight hundred fifty-one".