194120970181 has 4 divisors (see below), whose sum is σ = 198635411392. Its totient is φ = 189606528972.

The previous prime is 194120970157. The next prime is 194120970187. The reversal of 194120970181 is 181079021491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194120970181 is a prime.

It is a super-2 number, since 2×194120970181² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 4514441167 = 194120970181 / (1 + 9 + 4 + 1 + 2 + 0 + 9 + 7 + 0 + 1 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194120970187) 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, 2257220541 + ... + 2257220626.

It is an arithmetic number, because the mean of its divisors is an integer number (49658852848).

Almost surely, 2^194120970181 is an apocalyptic number.

It is an amenable number.

194120970181 is a deficient number, since it is larger than the sum of its proper divisors (4514441211).

194120970181 is an equidigital number, since it uses as much as digits as its factorization.

194120970181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4514441210.

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 194120970181 in words is "one hundred ninety-four billion, one hundred twenty million, nine hundred seventy thousand, one hundred eighty-one".