18011197 has 8 divisors (see below), whose sum is σ = 18343800. Its totient is φ = 17681664.

The previous prime is 18011179. The next prime is 18011207. The reversal of 18011197 is 79111081.

It can be written as a sum of positive squares in 4 ways, for example, as 1454436 + 16556761 = 1206^2 + 4069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18011197 - 2²³ = 9622589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18011137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13329 + ... + 14617.

It is an arithmetic number, because the mean of its divisors is an integer number (2292975).

Almost surely, 2^18011197 is an apocalyptic number.

It is an amenable number.

18011197 is a deficient number, since it is larger than the sum of its proper divisors (332603).

18011197 is a wasteful number, since it uses less digits than its factorization.

18011197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 18011197 is about 4243.9600610750. The cubic root of 18011197 is about 262.1284697151.

The spelling of 18011197 in words is "eighteen million, eleven thousand, one hundred ninety-seven".