18443461 has 2 divisors, whose sum is σ = 18443462. Its totient is φ = 18443460.

The previous prime is 18443443. The next prime is 18443531. The reversal of 18443461 is 16434481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 1674436 = 4095^2 + 1294^2 .

It is a cyclic number.

It is not a de Polignac number, because 18443461 - 2¹³ = 18435269 is a prime.

It is a super-2 number, since 2×18443461² = 680322507317042, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18443441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9221730 + 9221731.

It is an arithmetic number, because the mean of its divisors is an integer number (9221731).

Almost surely, 2^18443461 is an apocalyptic number.

It is an amenable number.

18443461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18443461 is an equidigital number, since it uses as much as digits as its factorization.

18443461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 31.

The square root of 18443461 is about 4294.5850789104. The cubic root of 18443461 is about 264.2089188399.

The spelling of 18443461 in words is "eighteen million, four hundred forty-three thousand, four hundred sixty-one".