191028973 has 2 divisors, whose sum is σ = 191028974. Its totient is φ = 191028972.

The previous prime is 191028967. The next prime is 191029019. The reversal of 191028973 is 379820191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141776649 + 49252324 = 11907^2 + 7018^2 .

It is a cyclic number.

It is not a de Polignac number, because 191028973 - 2⁵ = 191028941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191028923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95514486 + 95514487.

It is an arithmetic number, because the mean of its divisors is an integer number (95514487).

Almost surely, 2^191028973 is an apocalyptic number.

It is an amenable number.

191028973 is a deficient number, since it is larger than the sum of its proper divisors (1).

191028973 is an equidigital number, since it uses as much as digits as its factorization.

191028973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 191028973 is about 13821.3231276893. The cubic root of 191028973 is about 575.9256400358.

The spelling of 191028973 in words is "one hundred ninety-one million, twenty-eight thousand, nine hundred seventy-three".