18135601 has 12 divisors (see below), whose sum is σ = 20224512. Its totient is φ = 16247000.

The previous prime is 18135599. The next prime is 18135613. The reversal of 18135601 is 10653181.

It is not a de Polignac number, because 18135601 - 2¹ = 18135599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18135301) 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 11 ways as a sum of consecutive naturals, for example, 7536 + ... + 9646.

It is an arithmetic number, because the mean of its divisors is an integer number (1685376).

Almost surely, 2^18135601 is an apocalyptic number.

18135601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18135601 is the 1905-th centered decagonal number.

It is an amenable number.

18135601 is a deficient number, since it is larger than the sum of its proper divisors (2088911).

18135601 is a wasteful number, since it uses less digits than its factorization.

18135601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204 (or 2193 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 18135601 is about 4258.5914337959. The cubic root of 18135601 is about 262.7305958596.

Adding to 18135601 its reverse (10653181), we get a palindrome (28788782).

The spelling of 18135601 in words is "eighteen million, one hundred thirty-five thousand, six hundred one".