18091253 has 4 divisors (see below), whose sum is σ = 18115788. Its totient is φ = 18066720.

The previous prime is 18091243. The next prime is 18091279. The reversal of 18091253 is 35219081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35219081 = 3947 ⋅8923.

It can be written as a sum of positive squares in 2 ways, for example, as 1387684 + 16703569 = 1178^2 + 4087^2 .

It is a cyclic number.

It is not a de Polignac number, because 18091253 - 2⁶ = 18091189 is a prime.

It is a super-2 number, since 2×18091253² = 654586870220018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18091243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11126 + ... + 12647.

It is an arithmetic number, because the mean of its divisors is an integer number (4528947).

Almost surely, 2^18091253 is an apocalyptic number.

It is an amenable number.

18091253 is a deficient number, since it is larger than the sum of its proper divisors (24535).

18091253 is an equidigital number, since it uses as much as digits as its factorization.

18091253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24534.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 18091253 is about 4253.3813607529. The cubic root of 18091253 is about 262.5162644495.

The spelling of 18091253 in words is "eighteen million, ninety-one thousand, two hundred fifty-three".