18136001 has 4 divisors (see below), whose sum is σ = 19531092. Its totient is φ = 16740912.

The previous prime is 18135979. The next prime is 18136003. The reversal of 18136001 is 10063181.

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 3236401 + 14899600 = 1799^2 + 3860^2 .

It is a cyclic number.

It is not a de Polignac number, because 18136001 - 2¹⁸ = 17873857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18136003) 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, 697526 + ... + 697551.

It is an arithmetic number, because the mean of its divisors is an integer number (4882773).

Almost surely, 2^18136001 is an apocalyptic number.

It is an amenable number.

18136001 is a deficient number, since it is larger than the sum of its proper divisors (1395091).

18136001 is a wasteful number, since it uses less digits than its factorization.

18136001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395090.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 18136001 is about 4258.6383974223. The cubic root of 18136001 is about 262.7325274465.

Adding to 18136001 its reverse (10063181), we get a palindrome (28199182).

The spelling of 18136001 in words is "eighteen million, one hundred thirty-six thousand, one".