191892061 has 4 divisors (see below), whose sum is σ = 192219552. Its totient is φ = 191564572.

The previous prime is 191892017. The next prime is 191892067. The reversal of 191892061 is 160298191.

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, and also an emirpimes, since its reverse is a distinct semiprime: 160298191 = 71 ⋅2257721.

It is a cyclic number.

It is not a de Polignac number, because 191892061 - 2⁹ = 191891549 is a prime.

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 191892061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191892067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162865 + ... + 164038.

It is an arithmetic number, because the mean of its divisors is an integer number (48054888).

Almost surely, 2^191892061 is an apocalyptic number.

It is an amenable number.

191892061 is a deficient number, since it is larger than the sum of its proper divisors (327491).

191892061 is an equidigital number, since it uses as much as digits as its factorization.

191892061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327490.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 191892061 is about 13852.5109998152. The cubic root of 191892061 is about 576.7917002354.

The spelling of 191892061 in words is "one hundred ninety-one million, eight hundred ninety-two thousand, sixty-one".