1018643 has 2 divisors, whose sum is σ = 1018644. Its totient is φ = 1018642.

The previous prime is 1018621. The next prime is 1018649. The reversal of 1018643 is 3468101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1018643 - 2¹² = 1014547 is a prime.

It is a super-2 number, since 2×1018643² = 2075267122898, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1018649) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509321 + 509322.

It is an arithmetic number, because the mean of its divisors is an integer number (509322).

2^1018643 is an apocalyptic number.

1018643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018643 is an equidigital number, since it uses as much as digits as its factorization.

1018643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1018643 is about 1009.2784551352. The cubic root of 1018643 is about 100.6176110465.

It can be divided in two parts, 1018 and 643, that added together give a palindrome (1661).

The spelling of 1018643 in words is "one million, eighteen thousand, six hundred forty-three".