1312191 has 6 divisors (see below), whose sum is σ = 1895400. Its totient is φ = 874788.

The previous prime is 1312189. The next prime is 1312211. The reversal of 1312191 is 1912131.

It is not a de Polignac number, because 1312191 - 2¹ = 1312189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312391) 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 5 ways as a sum of consecutive naturals, for example, 72891 + ... + 72908.

It is an arithmetic number, because the mean of its divisors is an integer number (315900).

2^1312191 is an apocalyptic number.

1312191 is a deficient number, since it is larger than the sum of its proper divisors (583209).

1312191 is a wasteful number, since it uses less digits than its factorization.

1312191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145805 (or 145802 counting only the distinct ones).

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

The square root of 1312191 is about 1145.5090571445. The cubic root of 1312191 is about 109.4793856234.

The spelling of 1312191 in words is "one million, three hundred twelve thousand, one hundred ninety-one".