191117943 has 12 divisors (see below), whose sum is σ = 278640648. Its totient is φ = 126220560.

The previous prime is 191117923. The next prime is 191117981. The reversal of 191117943 is 349711191.

It is not a de Polignac number, because 191117943 - 2²¹ = 189020791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191117898 and 191117907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191117923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98268 + ... + 100193.

It is an arithmetic number, because the mean of its divisors is an integer number (23220054).

Almost surely, 2^191117943 is an apocalyptic number.

191117943 is a deficient number, since it is larger than the sum of its proper divisors (87522705).

191117943 is a wasteful number, since it uses less digits than its factorization.

191117943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198574 (or 198571 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 191117943 is about 13824.5413305469. The cubic root of 191117943 is about 576.0150368615.

The spelling of 191117943 in words is "one hundred ninety-one million, one hundred seventeen thousand, nine hundred forty-three".