18071001 has 27 divisors (see below), whose sum is σ = 28526589. Its totient is φ = 11018592.

The previous prime is 18070999. The next prime is 18071087. The reversal of 18071001 is 10017081.

The square root of 18071001 is 4251.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 632025 + 17438976 = 795^2 + 4176^2 .

It is not a de Polignac number, because 18071001 - 2¹ = 18070999 is a prime.

It is a super-2 number, since 2×18071001² = 653122154284002, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18070001) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 165735 + ... + 165843.

Almost surely, 2^18071001 is an apocalyptic number.

18071001 is the 4251-st square number.

18071001 is the 2126-th centered octagonal number.

It is an amenable number.

18071001 is a deficient number, since it is larger than the sum of its proper divisors (10455588).

18071001 is a wasteful number, since it uses less digits than its factorization.

18071001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

The cubic root of 18071001 is about 262.4182711552.

Adding to 18071001 its reverse (10017081), we get a palindrome (28088082).

The spelling of 18071001 in words is "eighteen million, seventy-one thousand, one".