18471050191 has 4 divisors (see below), whose sum is σ = 20150236584. Its totient is φ = 16791863800.

The previous prime is 18471050189. The next prime is 18471050209. The reversal of 18471050191 is 19105017481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19105017481 = 11 ⋅1736819771.

It is a cyclic number.

It is not a de Polignac number, because 18471050191 - 2¹ = 18471050189 is a prime.

It is a super-2 number, since 2×18471050191² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18471050191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18471050111) 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, 839593180 + ... + 839593201.

It is an arithmetic number, because the mean of its divisors is an integer number (5037559146).

Almost surely, 2^18471050191 is an apocalyptic number.

18471050191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18471050191 is a deficient number, since it is larger than the sum of its proper divisors (1679186393).

18471050191 is a wasteful number, since it uses less digits than its factorization.

18471050191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679186392.

The product of its (nonzero) digits is 10080, while the sum is 37.

The spelling of 18471050191 in words is "eighteen billion, four hundred seventy-one million, fifty thousand, one hundred ninety-one".