18021527 has 2 divisors, whose sum is σ = 18021528. Its totient is φ = 18021526.

The previous prime is 18021511. The next prime is 18021529. The reversal of 18021527 is 72512081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18021527 - 2⁴ = 18021511 is a prime.

Together with 18021529, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18021496 and 18021505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18021529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010763 + 9010764.

It is an arithmetic number, because the mean of its divisors is an integer number (9010764).

Almost surely, 2^18021527 is an apocalyptic number.

18021527 is a deficient number, since it is larger than the sum of its proper divisors (1).

18021527 is an equidigital number, since it uses as much as digits as its factorization.

18021527 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 18021527 is about 4245.1769103301. The cubic root of 18021527 is about 262.1785731700.

The spelling of 18021527 in words is "eighteen million, twenty-one thousand, five hundred twenty-seven".