1091947 has 4 divisors (see below), whose sum is σ = 1097856. Its totient is φ = 1086040.

The previous prime is 1091939. The next prime is 1091957. The reversal of 1091947 is 7491901.

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 1091947 - 2³ = 1091939 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1091947 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1091917) 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, 2668 + ... + 3049.

It is an arithmetic number, because the mean of its divisors is an integer number (274464).

2^1091947 is an apocalyptic number.

1091947 is a deficient number, since it is larger than the sum of its proper divisors (5909).

1091947 is an equidigital number, since it uses as much as digits as its factorization.

1091947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 1091947 is about 1044.9626787594. The cubic root of 1091947 is about 102.9754866728.

The spelling of 1091947 in words is "one million, ninety-one thousand, nine hundred forty-seven".