191005469 has 2 divisors, whose sum is σ = 191005470. Its totient is φ = 191005468.

The previous prime is 191005427. The next prime is 191005471. The reversal of 191005469 is 964500191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168013444 + 22992025 = 12962^2 + 4795^2 .

It is a cyclic number.

It is not a de Polignac number, because 191005469 - 2²⁴ = 174228253 is a prime.

It is a super-2 number, since 2×191005469² = 72966178375819922, which contains 22 as substring.

Together with 191005471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191005769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95502734 + 95502735.

It is an arithmetic number, because the mean of its divisors is an integer number (95502735).

Almost surely, 2^191005469 is an apocalyptic number.

It is an amenable number.

191005469 is a deficient number, since it is larger than the sum of its proper divisors (1).

191005469 is an equidigital number, since it uses as much as digits as its factorization.

191005469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 191005469 is about 13820.4728211447. The cubic root of 191005469 is about 575.9020186426.

The spelling of 191005469 in words is "one hundred ninety-one million, five thousand, four hundred sixty-nine".