18361901 has 8 divisors (see below), whose sum is σ = 19186200. Its totient is φ = 17550400.

The previous prime is 18361897. The next prime is 18361957. The reversal of 18361901 is 10916381.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5929225 + 12432676 = 2435^2 + 3526^2 .

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 18361901 - 2² = 18361897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18361991) 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 7 ways as a sum of consecutive naturals, for example, 206 + ... + 6063.

It is an arithmetic number, because the mean of its divisors is an integer number (2398275).

Almost surely, 2^18361901 is an apocalyptic number.

It is an amenable number.

18361901 is a deficient number, since it is larger than the sum of its proper divisors (824299).

18361901 is a wasteful number, since it uses less digits than its factorization.

18361901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6399.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 18361901 is about 4285.0788790873. The cubic root of 18361901 is about 263.8188849970.

The spelling of 18361901 in words is "eighteen million, three hundred sixty-one thousand, nine hundred one".