11191947 has 8 divisors (see below), whose sum is σ = 16070544. Its totient is φ = 6887328.

The previous prime is 11191937. The next prime is 11191951. The reversal of 11191947 is 74919111.

11191947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 11191947 - 2¹⁹ = 10667659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11191907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143448 + ... + 143525.

It is an arithmetic number, because the mean of its divisors is an integer number (2008818).

Almost surely, 2^11191947 is an apocalyptic number.

11191947 is a deficient number, since it is larger than the sum of its proper divisors (4878597).

11191947 is a wasteful number, since it uses less digits than its factorization.

11191947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286989.

The product of its digits is 2268, while the sum is 33.

The square root of 11191947 is about 3345.4367427886. The cubic root of 11191947 is about 223.6841517373.

The spelling of 11191947 in words is "eleven million, one hundred ninety-one thousand, nine hundred forty-seven".