18131071 has 12 divisors (see below), whose sum is σ = 21071568. Its totient is φ = 15282432.

The previous prime is 18131051. The next prime is 18131077. The reversal of 18131071 is 17013181.

It is not a de Polignac number, because 18131071 - 2⁵ = 18131039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18131077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31135 + ... + 31711.

It is an arithmetic number, because the mean of its divisors is an integer number (1755964).

Almost surely, 2^18131071 is an apocalyptic number.

18131071 is a deficient number, since it is larger than the sum of its proper divisors (2940497).

18131071 is an frugal number, since it uses more digits than its factorization.

18131071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 22.

The square root of 18131071 is about 4258.0595345768. The cubic root of 18131071 is about 262.7087186560.

The spelling of 18131071 in words is "eighteen million, one hundred thirty-one thousand, seventy-one".