191406847 has 2 divisors, whose sum is σ = 191406848. Its totient is φ = 191406846.

The previous prime is 191406829. The next prime is 191406869. The reversal of 191406847 is 748604191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191406847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191406877) 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, 95703423 + 95703424.

It is an arithmetic number, because the mean of its divisors is an integer number (95703424).

Almost surely, 2^191406847 is an apocalyptic number.

191406847 is a deficient number, since it is larger than the sum of its proper divisors (1).

191406847 is an equidigital number, since it uses as much as digits as its factorization.

191406847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 191406847 is about 13834.9863389886. The cubic root of 191406847 is about 576.3051356752.

The spelling of 191406847 in words is "one hundred ninety-one million, four hundred six thousand, eight hundred forty-seven".