18125971 has 4 divisors (see below), whose sum is σ = 18134512. Its totient is φ = 18117432.

The previous prime is 18125969. The next prime is 18125983. The reversal of 18125971 is 17952181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18125971 - 2¹ = 18125969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18125911) 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, 1645 + ... + 6241.

It is an arithmetic number, because the mean of its divisors is an integer number (4533628).

Almost surely, 2^18125971 is an apocalyptic number.

18125971 is a deficient number, since it is larger than the sum of its proper divisors (8541).

18125971 is an equidigital number, since it uses as much as digits as its factorization.

18125971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540.

The product of its digits is 5040, while the sum is 34.

The square root of 18125971 is about 4257.4606281209. The cubic root of 18125971 is about 262.6840843306.

The spelling of 18125971 in words is "eighteen million, one hundred twenty-five thousand, nine hundred seventy-one".