1213191 has 32 divisors (see below), whose sum is σ = 2112000. Its totient is φ = 687960.

The previous prime is 1213189. The next prime is 1213213. The reversal of 1213191 is 1913121.

It is not a de Polignac number, because 1213191 - 2¹ = 1213189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9196 + ... + 9326.

It is an arithmetic number, because the mean of its divisors is an integer number (66000).

2^1213191 is an apocalyptic number.

1213191 is a deficient number, since it is larger than the sum of its proper divisors (898809).

1213191 is an equidigital number, since it uses as much as digits as its factorization.

1213191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 141 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

The square root of 1213191 is about 1101.4494995232. The cubic root of 1213191 is about 106.6538146408.

It can be divided in two parts, 12 and 13191, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 1213191 in words is "one million, two hundred thirteen thousand, one hundred ninety-one".