18225919 has 2 divisors, whose sum is σ = 18225920. Its totient is φ = 18225918.

The previous prime is 18225917. The next prime is 18225947. The reversal of 18225919 is 91952281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18225919 - 2¹ = 18225917 is a prime.

It is a super-2 number, since 2×18225919² = 664368246789122, which contains 22 as substring.

Together with 18225917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18225917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9112959 + 9112960.

It is an arithmetic number, because the mean of its divisors is an integer number (9112960).

Almost surely, 2^18225919 is an apocalyptic number.

18225919 is a deficient number, since it is larger than the sum of its proper divisors (1).

18225919 is an equidigital number, since it uses as much as digits as its factorization.

18225919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 18225919 is about 4269.1824744323. The cubic root of 18225919 is about 263.1660196937.

The spelling of 18225919 in words is "eighteen million, two hundred twenty-five thousand, nine hundred nineteen".