18321701 has 4 divisors (see below), whose sum is σ = 18489900. Its totient is φ = 18153504.

The previous prime is 18321691. The next prime is 18321739. The reversal of 18321701 is 10712381.

It is a happy number.

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 5712100 + 12609601 = 2390^2 + 3551^2 .

It is a cyclic number.

It is not a de Polignac number, because 18321701 - 2¹⁰ = 18320677 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 (18321761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83936 + ... + 84153.

It is an arithmetic number, because the mean of its divisors is an integer number (4622475).

Almost surely, 2^18321701 is an apocalyptic number.

It is an amenable number.

18321701 is a deficient number, since it is larger than the sum of its proper divisors (168199).

18321701 is a wasteful number, since it uses less digits than its factorization.

18321701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168198.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 18321701 is about 4280.3856134699. The cubic root of 18321701 is about 263.6262167067.

The spelling of 18321701 in words is "eighteen million, three hundred twenty-one thousand, seven hundred one".