18125501 has 4 divisors (see below), whose sum is σ = 18291900. Its totient is φ = 17959104.

The previous prime is 18125477. The next prime is 18125507. The reversal of 18125501 is 10552181.

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 11628100 + 6497401 = 3410^2 + 2549^2 .

It is a cyclic number.

It is not a de Polignac number, because 18125501 - 2¹⁸ = 17863357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18125507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83036 + ... + 83253.

It is an arithmetic number, because the mean of its divisors is an integer number (4572975).

Almost surely, 2^18125501 is an apocalyptic number.

It is an amenable number.

18125501 is a deficient number, since it is larger than the sum of its proper divisors (166399).

18125501 is a wasteful number, since it uses less digits than its factorization.

18125501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166398.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 18125501 is about 4257.4054305410. The cubic root of 18125501 is about 262.6818138759.

Adding to 18125501 its reverse (10552181), we get a palindrome (28677682).

The spelling of 18125501 in words is "eighteen million, one hundred twenty-five thousand, five hundred one".