18966481 has 2 divisors, whose sum is σ = 18966482. Its totient is φ = 18966480.

The previous prime is 18966469. The next prime is 18966511. The reversal of 18966481 is 18466981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13249600 + 5716881 = 3640^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 18966481 - 2¹⁷ = 18835409 is a prime.

It is a super-2 number, since 2×18966481² = 719454803046722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18966401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9483240 + 9483241.

It is an arithmetic number, because the mean of its divisors is an integer number (9483241).

Almost surely, 2^18966481 is an apocalyptic number.

It is an amenable number.

18966481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18966481 is an equidigital number, since it uses as much as digits as its factorization.

18966481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 43.

The square root of 18966481 is about 4355.0523533019. The cubic root of 18966481 is about 266.6831564456.

Subtracting from 18966481 its reverse (18466981), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 18966481 in words is "eighteen million, nine hundred sixty-six thousand, four hundred eighty-one".