191868673 has 2 divisors, whose sum is σ = 191868674. Its totient is φ = 191868672.

The previous prime is 191868671. The next prime is 191868697. The reversal of 191868673 is 376868191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167780209 + 24088464 = 12953^2 + 4908^2 .

It is a cyclic number.

It is not a de Polignac number, because 191868673 - 2¹ = 191868671 is a prime.

Together with 191868671, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (191868671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95934336 + 95934337.

It is an arithmetic number, because the mean of its divisors is an integer number (95934337).

Almost surely, 2^191868673 is an apocalyptic number.

It is an amenable number.

191868673 is a deficient number, since it is larger than the sum of its proper divisors (1).

191868673 is an equidigital number, since it uses as much as digits as its factorization.

191868673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 191868673 is about 13851.6667950106. Note that the first 3 decimals coincide. The cubic root of 191868673 is about 576.7682659632.

The spelling of 191868673 in words is "one hundred ninety-one million, eight hundred sixty-eight thousand, six hundred seventy-three".