191112947 has 4 divisors (see below), whose sum is σ = 191402736. Its totient is φ = 190823160.

The previous prime is 191112937. The next prime is 191112953. The reversal of 191112947 is 749211191.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 191112947 - 2¹⁰ = 191111923 is a prime.

It is a super-2 number, since 2×191112947² = 73048317022049618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191112917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143903 + ... + 145224.

It is an arithmetic number, because the mean of its divisors is an integer number (47850684).

Almost surely, 2^191112947 is an apocalyptic number.

191112947 is a deficient number, since it is larger than the sum of its proper divisors (289789).

191112947 is an equidigital number, since it uses as much as digits as its factorization.

191112947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289788.

The product of its digits is 4536, while the sum is 35.

The square root of 191112947 is about 13824.3606362103. The cubic root of 191112947 is about 576.0100176290.

The spelling of 191112947 in words is "one hundred ninety-one million, one hundred twelve thousand, nine hundred forty-seven".