18201601 has 16 divisors (see below), whose sum is σ = 21205440. Its totient is φ = 15448320.

The previous prime is 18201587. The next prime is 18201629. The reversal of 18201601 is 10610281.

It is a cyclic number.

It is not a de Polignac number, because 18201601 - 2⁵ = 18201569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18201661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14661 + ... + 15853.

It is an arithmetic number, because the mean of its divisors is an integer number (1325340).

Almost surely, 2^18201601 is an apocalyptic number.

18201601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18201601 is a deficient number, since it is larger than the sum of its proper divisors (3003839).

18201601 is a wasteful number, since it uses less digits than its factorization.

18201601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 18201601 is about 4266.3334375081. Note that the first 3 decimals coincide. The cubic root of 18201601 is about 263.0489241874.

Adding to 18201601 its reverse (10610281), we get a palindrome (28811882).

The spelling of 18201601 in words is "eighteen million, two hundred one thousand, six hundred one".