18521023 has 2 divisors, whose sum is σ = 18521024. Its totient is φ = 18521022.

The previous prime is 18521021. The next prime is 18521047. The reversal of 18521023 is 32012581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18521023 - 2¹ = 18521021 is a prime.

Together with 18521021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18520985 and 18521003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18521021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9260511 + 9260512.

It is an arithmetic number, because the mean of its divisors is an integer number (9260512).

Almost surely, 2^18521023 is an apocalyptic number.

18521023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18521023 is an equidigital number, since it uses as much as digits as its factorization.

18521023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18521023 is about 4303.6058137334. The cubic root of 18521023 is about 264.5787683067.

The spelling of 18521023 in words is "eighteen million, five hundred twenty-one thousand, twenty-three".