18444961 has 2 divisors, whose sum is σ = 18444962. Its totient is φ = 18444960.

The previous prime is 18444941. The next prime is 18444967. The reversal of 18444961 is 16944481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11390625 + 7054336 = 3375^2 + 2656^2 .

It is an emirp because it is prime and its reverse (16944481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18444961 - 2⁵ = 18444929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18444961.

It is not a weakly prime, because it can be changed into another prime (18444967) 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, 9222480 + 9222481.

It is an arithmetic number, because the mean of its divisors is an integer number (9222481).

Almost surely, 2^18444961 is an apocalyptic number.

It is an amenable number.

18444961 is a deficient number, since it is larger than the sum of its proper divisors (1).

18444961 is an equidigital number, since it uses as much as digits as its factorization.

18444961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 18444961 is about 4294.7597138839. The cubic root of 18444961 is about 264.2160813176.

The spelling of 18444961 in words is "eighteen million, four hundred forty-four thousand, nine hundred sixty-one".