191320949 has 4 divisors (see below), whose sum is σ = 194457420. Its totient is φ = 188184480.

The previous prime is 191320939. The next prime is 191320951. The reversal of 191320949 is 949023191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91680625 + 99640324 = 9575^2 + 9982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191320949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191320939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1568144 + ... + 1568265.

It is an arithmetic number, because the mean of its divisors is an integer number (48614355).

Almost surely, 2^191320949 is an apocalyptic number.

It is an amenable number.

191320949 is a deficient number, since it is larger than the sum of its proper divisors (3136471).

191320949 is an equidigital number, since it uses as much as digits as its factorization.

191320949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3136470.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 191320949 is about 13831.8816145888. The cubic root of 191320949 is about 576.2189129400.

The spelling of 191320949 in words is "one hundred ninety-one million, three hundred twenty thousand, nine hundred forty-nine".