191606249 has 2 divisors, whose sum is σ = 191606250. Its totient is φ = 191606248.

The previous prime is 191606197. The next prime is 191606251. The reversal of 191606249 is 942606191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109830400 + 81775849 = 10480^2 + 9043^2 .

It is a cyclic number.

It is not a de Polignac number, because 191606249 - 2⁸ = 191605993 is a prime.

Together with 191606251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191606749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95803124 + 95803125.

It is an arithmetic number, because the mean of its divisors is an integer number (95803125).

Almost surely, 2^191606249 is an apocalyptic number.

It is an amenable number.

191606249 is a deficient number, since it is larger than the sum of its proper divisors (1).

191606249 is an equidigital number, since it uses as much as digits as its factorization.

191606249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 191606249 is about 13842.1909031771. The cubic root of 191606249 is about 576.5051921101.

The spelling of 191606249 in words is "one hundred ninety-one million, six hundred six thousand, two hundred forty-nine".