194421261187 has 4 divisors (see below), whose sum is σ = 195545083680. Its totient is φ = 193297438696.

The previous prime is 194421261179. The next prime is 194421261241. The reversal of 194421261187 is 781162124491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781162124491 = 7 ⋅111594589213.

It is a cyclic number.

It is not a de Polignac number, because 194421261187 - 2³ = 194421261179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194421961187) 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, 561910987 + ... + 561911332.

It is an arithmetic number, because the mean of its divisors is an integer number (48886270920).

Almost surely, 2^194421261187 is an apocalyptic number.

194421261187 is a deficient number, since it is larger than the sum of its proper divisors (1123822493).

194421261187 is a wasteful number, since it uses less digits than its factorization.

194421261187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123822492.

The product of its digits is 193536, while the sum is 46.

The spelling of 194421261187 in words is "one hundred ninety-four billion, four hundred twenty-one million, two hundred sixty-one thousand, one hundred eighty-seven".