18263481 has 4 divisors (see below), whose sum is σ = 24351312. Its totient is φ = 12175652.

The previous prime is 18263471. The next prime is 18263521. The reversal of 18263481 is 18436281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18436281 = 3 ⋅6145427.

It is a cyclic number.

It is not a de Polignac number, because 18263481 - 2⁷ = 18263353 is a prime.

It is a super-2 number, since 2×18263481² = 667109476474722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18263431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3043911 + ... + 3043916.

It is an arithmetic number, because the mean of its divisors is an integer number (6087828).

Almost surely, 2^18263481 is an apocalyptic number.

It is an amenable number.

18263481 is a deficient number, since it is larger than the sum of its proper divisors (6087831).

18263481 is an equidigital number, since it uses as much as digits as its factorization.

18263481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087830.

The product of its digits is 9216, while the sum is 33.

The square root of 18263481 is about 4273.5794130916. The cubic root of 18263481 is about 263.3466829031.

The spelling of 18263481 in words is "eighteen million, two hundred sixty-three thousand, four hundred eighty-one".