191434897 has 8 divisors (see below), whose sum is σ = 195422760. Its totient is φ = 187474560.

The previous prime is 191434891. The next prime is 191434913. The reversal of 191434897 is 798434191.

It is a Cunningham number, because it is equal to 13836²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 191434896 = 1^2 + 13836^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191434897 - 2¹¹ = 191432849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191434891) 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 in 7 ways as a sum of consecutive naturals, for example, 7479 + ... + 20947.

It is an arithmetic number, because the mean of its divisors is an integer number (24427845).

Almost surely, 2^191434897 is an apocalyptic number.

It is an amenable number.

191434897 is a deficient number, since it is larger than the sum of its proper divisors (3987863).

191434897 is a wasteful number, since it uses less digits than its factorization.

191434897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13763.

The product of its digits is 217728, while the sum is 46.

The square root of 191434897 is about 13836.0000361376. Note that the first 4 decimals coincide. The cubic root of 191434897 is about 576.3332861302. Note that the first 3 decimals are identical.

The spelling of 191434897 in words is "one hundred ninety-one million, four hundred thirty-four thousand, eight hundred ninety-seven".