18021319 has 2 divisors, whose sum is σ = 18021320. Its totient is φ = 18021318.

The previous prime is 18021307. The next prime is 18021337. The reversal of 18021319 is 91312081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18021319 - 2⁵ = 18021287 is a prime.

It is a super-2 number, since 2×18021319² = 649535876999522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18021293 and 18021302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18021379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010659 + 9010660.

It is an arithmetic number, because the mean of its divisors is an integer number (9010660).

Almost surely, 2^18021319 is an apocalyptic number.

18021319 is a deficient number, since it is larger than the sum of its proper divisors (1).

18021319 is an equidigital number, since it uses as much as digits as its factorization.

18021319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 18021319 is about 4245.1524118693. The cubic root of 18021319 is about 262.1775644994.

The spelling of 18021319 in words is "eighteen million, twenty-one thousand, three hundred nineteen".