1191271 has 4 divisors (see below), whose sum is σ = 1193544. Its totient is φ = 1189000.

The previous prime is 1191247. The next prime is 1191277. The reversal of 1191271 is 1721911.

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 1191271 - 2¹³ = 1183079 is a prime.

It is a Smith number, since the sum of its digits (22) 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.

1191271 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (298386).

2^1191271 is an apocalyptic number.

1191271 is a deficient number, since it is larger than the sum of its proper divisors (2273).

1191271 is an equidigital number, since it uses as much as digits as its factorization.

1191271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272.

The product of its digits is 126, while the sum is 22.

The square root of 1191271 is about 1091.4536178876. The cubic root of 1191271 is about 106.0075644299.

The spelling of 1191271 in words is "one million, one hundred ninety-one thousand, two hundred seventy-one".