191679349 has 2 divisors, whose sum is σ = 191679350. Its totient is φ = 191679348.

The previous prime is 191679347. The next prime is 191679379. The reversal of 191679349 is 943976191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110355025 + 81324324 = 10505^2 + 9018^2 .

It is an emirp because it is prime and its reverse (943976191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191679349 - 2¹ = 191679347 is a prime.

Together with 191679347, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191679347) 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 as a sum of consecutive naturals, namely, 95839674 + 95839675.

It is an arithmetic number, because the mean of its divisors is an integer number (95839675).

Almost surely, 2^191679349 is an apocalyptic number.

It is an amenable number.

191679349 is a deficient number, since it is larger than the sum of its proper divisors (1).

191679349 is an equidigital number, since it uses as much as digits as its factorization.

191679349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 191679349 is about 13844.8311293421. The cubic root of 191679349 is about 576.5784972547.

The spelling of 191679349 in words is "one hundred ninety-one million, six hundred seventy-nine thousand, three hundred forty-nine".