1201191 has 8 divisors (see below), whose sum is σ = 1607424. Its totient is φ = 797880.

The previous prime is 1201183. The next prime is 1201201. The reversal of 1201191 is 1911021.

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

It is not a de Polignac number, because 1201191 - 2³ = 1201183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201111) 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, 556 + ... + 1646.

It is an arithmetic number, because the mean of its divisors is an integer number (200928).

2^1201191 is an apocalyptic number.

1201191 is a deficient number, since it is larger than the sum of its proper divisors (406233).

1201191 is a wasteful number, since it uses less digits than its factorization.

1201191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461.

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 1201191 is about 1095.9885948312. The cubic root of 1201191 is about 106.3010015815.

The spelling of 1201191 in words is "one million, two hundred one thousand, one hundred ninety-one".