191434913 has 2 divisors, whose sum is σ = 191434914. Its totient is φ = 191434912.

The previous prime is 191434891. The next prime is 191434921. The reversal of 191434913 is 319434191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181899169 + 9535744 = 13487^2 + 3088^2 .

It is an emirp because it is prime and its reverse (319434191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191434913 - 2⁶ = 191434849 is a prime.

It is not a weakly prime, because it can be changed into another prime (191434973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95717456 + 95717457.

It is an arithmetic number, because the mean of its divisors is an integer number (95717457).

Almost surely, 2^191434913 is an apocalyptic number.

It is an amenable number.

191434913 is a deficient number, since it is larger than the sum of its proper divisors (1).

191434913 is an equidigital number, since it uses as much as digits as its factorization.

191434913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 35.

The square root of 191434913 is about 13836.0006143394. Note that the first 3 decimals coincide. The cubic root of 191434913 is about 576.3333021867. Note that the first 4 decimals are identical.

The spelling of 191434913 in words is "one hundred ninety-one million, four hundred thirty-four thousand, nine hundred thirteen".