1816242871 has 4 divisors (see below), whose sum is σ = 1826277544. Its totient is φ = 1806208200.

The previous prime is 1816242859. The next prime is 1816242907. The reversal of 1816242871 is 1782426181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1816242871 - 2⁹ = 1816242359 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 (1816246871) 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, 5017065 + ... + 5017426.

It is an arithmetic number, because the mean of its divisors is an integer number (456569386).

Almost surely, 2^1816242871 is an apocalyptic number.

1816242871 is a deficient number, since it is larger than the sum of its proper divisors (10034673).

1816242871 is a wasteful number, since it uses less digits than its factorization.

1816242871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10034672.

The product of its digits is 43008, while the sum is 40.

The square root of 1816242871 is about 42617.4010352579. The cubic root of 1816242871 is about 1220.0884265835.

The spelling of 1816242871 in words is "one billion, eight hundred sixteen million, two hundred forty-two thousand, eight hundred seventy-one".