18513043 has 2 divisors, whose sum is σ = 18513044. Its totient is φ = 18513042.

The previous prime is 18513041. The next prime is 18513113. The reversal of 18513043 is 34031581.

It is a weak prime.

It is an emirp because it is prime and its reverse (34031581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18513043 - 2¹ = 18513041 is a prime.

It is a super-2 number, since 2×18513043² = 685465522239698, which contains 22 as substring.

Together with 18513041, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18512999 and 18513017.

It is not a weakly prime, because it can be changed into another prime (18513041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256521 + 9256522.

It is an arithmetic number, because the mean of its divisors is an integer number (9256522).

Almost surely, 2^18513043 is an apocalyptic number.

18513043 is a deficient number, since it is larger than the sum of its proper divisors (1).

18513043 is an equidigital number, since it uses as much as digits as its factorization.

18513043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 18513043 is about 4302.6785843240. The cubic root of 18513043 is about 264.5407638927.

The spelling of 18513043 in words is "eighteen million, five hundred thirteen thousand, forty-three".