18095521 has 2 divisors, whose sum is σ = 18095522. Its totient is φ = 18095520.

The previous prime is 18095513. The next prime is 18095527. The reversal of 18095521 is 12559081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13950225 + 4145296 = 3735^2 + 2036^2 .

It is a cyclic number.

It is not a de Polignac number, because 18095521 - 2³ = 18095513 is a prime.

It is a super-2 number, since 2×18095521² = 654895760522882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18095527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9047760 + 9047761.

It is an arithmetic number, because the mean of its divisors is an integer number (9047761).

Almost surely, 2^18095521 is an apocalyptic number.

It is an amenable number.

18095521 is a deficient number, since it is larger than the sum of its proper divisors (1).

18095521 is an equidigital number, since it uses as much as digits as its factorization.

18095521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 18095521 is about 4253.8830496383. The cubic root of 18095521 is about 262.5369066778.

The spelling of 18095521 in words is "eighteen million, ninety-five thousand, five hundred twenty-one".