191667919481 has 4 divisors (see below), whose sum is σ = 193821491700. Its totient is φ = 189514347264.

The previous prime is 191667919463. The next prime is 191667919507. The reversal of 191667919481 is 184919766191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184919766191 = 59197 ⋅3123803.

It can be written as a sum of positive squares in 2 ways, for example, as 71438598400 + 120229321081 = 267280^2 + 346741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191667919481 is a prime.

It is a super-3 number, since 3×191667919481³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191667919181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076785976 + ... + 1076786153.

It is an arithmetic number, because the mean of its divisors is an integer number (48455372925).

Almost surely, 2^191667919481 is an apocalyptic number.

It is an amenable number.

191667919481 is a deficient number, since it is larger than the sum of its proper divisors (2153572219).

191667919481 is an equidigital number, since it uses as much as digits as its factorization.

191667919481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153572218.

The product of its digits is 5878656, while the sum is 62.

The spelling of 191667919481 in words is "one hundred ninety-one billion, six hundred sixty-seven million, nine hundred nineteen thousand, four hundred eighty-one".