18097521 has 16 divisors (see below), whose sum is σ = 26826240. Its totient is φ = 10776960.

The previous prime is 18097511. The next prime is 18097529. The reversal of 18097521 is 12579081.

It is not a de Polignac number, because 18097521 - 2⁷ = 18097393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18097529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6276 + ... + 8693.

It is an arithmetic number, because the mean of its divisors is an integer number (1676640).

Almost surely, 2^18097521 is an apocalyptic number.

It is an amenable number.

18097521 is a deficient number, since it is larger than the sum of its proper divisors (8728719).

18097521 is a wasteful number, since it uses less digits than its factorization.

18097521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15016.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 18097521 is about 4254.1181224785. The cubic root of 18097521 is about 262.5465785826.

It can be divided in two parts, 1809752 and 1, that added together give a triangular number (1809753 = T₁₉₀₂).

The spelling of 18097521 in words is "eighteen million, ninety-seven thousand, five hundred twenty-one".