191326973 has 2 divisors, whose sum is σ = 191326974. Its totient is φ = 191326972.

The previous prime is 191326957. The next prime is 191326987. The reversal of 191326973 is 379623191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179479609 + 11847364 = 13397^2 + 3442^2 .

It is a cyclic number.

It is not a de Polignac number, because 191326973 - 2⁴ = 191326957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191326973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191326913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95663486 + 95663487.

It is an arithmetic number, because the mean of its divisors is an integer number (95663487).

Almost surely, 2^191326973 is an apocalyptic number.

It is an amenable number.

191326973 is a deficient number, since it is larger than the sum of its proper divisors (1).

191326973 is an equidigital number, since it uses as much as digits as its factorization.

191326973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 41.

The square root of 191326973 is about 13832.0993706668. The cubic root of 191326973 is about 576.2249605550.

The spelling of 191326973 in words is "one hundred ninety-one million, three hundred twenty-six thousand, nine hundred seventy-three".