18071071 has 4 divisors (see below), whose sum is σ = 19022200. Its totient is φ = 17119944.

The previous prime is 18070999. The next prime is 18071087. The reversal of 18071071 is 17017081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17017081 = 53 ⋅321077.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18071071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18071671) 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, 475536 + ... + 475573.

It is an arithmetic number, because the mean of its divisors is an integer number (4755550).

Almost surely, 2^18071071 is an apocalyptic number.

18071071 is a deficient number, since it is larger than the sum of its proper divisors (951129).

18071071 is an equidigital number, since it uses as much as digits as its factorization.

18071071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951128.

The product of its (nonzero) digits is 392, while the sum is 25.

The square root of 18071071 is about 4251.0082333489. The cubic root of 18071071 is about 262.4186099900.

The spelling of 18071071 in words is "eighteen million, seventy-one thousand, seventy-one".