18031669 has 4 divisors (see below), whose sum is σ = 18049696. Its totient is φ = 18013644.

The previous prime is 18031633. The next prime is 18031681. The reversal of 18031669 is 96613081.

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.

It is a cyclic number.

It is not a de Polignac number, because 18031669 - 2¹¹ = 18029621 is a prime.

It is a super-2 number, since 2×18031669² = 650282173851122, 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 (18031619) 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, 7419 + ... + 9544.

It is an arithmetic number, because the mean of its divisors is an integer number (4512424).

Almost surely, 2^18031669 is an apocalyptic number.

It is an amenable number.

18031669 is a deficient number, since it is larger than the sum of its proper divisors (18027).

18031669 is a wasteful number, since it uses less digits than its factorization.

18031669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18026.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 18031669 is about 4246.3712743942. The cubic root of 18031669 is about 262.2277461477.

The spelling of 18031669 in words is "eighteen million, thirty-one thousand, six hundred sixty-nine".