18281069 has 4 divisors (see below), whose sum is σ = 19356444. Its totient is φ = 17205696.

The previous prime is 18281047. The next prime is 18281077. The reversal of 18281069 is 96018281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5593225 + 12687844 = 2365^2 + 3562^2 .

It is a cyclic number.

It is not a de Polignac number, because 18281069 - 2²⁰ = 17232493 is a prime.

It is a super-2 number, since 2×18281069² = 668394967565522, 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 (18281089) 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, 537662 + ... + 537695.

It is an arithmetic number, because the mean of its divisors is an integer number (4839111).

Almost surely, 2^18281069 is an apocalyptic number.

It is an amenable number.

18281069 is a deficient number, since it is larger than the sum of its proper divisors (1075375).

18281069 is a wasteful number, since it uses less digits than its factorization.

18281069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075374.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 18281069 is about 4275.6366777358. The cubic root of 18281069 is about 263.4311913537.

The spelling of 18281069 in words is "eighteen million, two hundred eighty-one thousand, sixty-nine".