1321191 has 12 divisors (see below), whose sum is σ = 1979432. Its totient is φ = 880632.

The previous prime is 1321171. The next prime is 1321193. The reversal of 1321191 is 1911231.

It is not a de Polignac number, because 1321191 - 2⁷ = 1321063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2476 + ... + 2961.

2^1321191 is an apocalyptic number.

1321191 is a deficient number, since it is larger than the sum of its proper divisors (658241).

1321191 is an frugal number, since it uses more digits than its factorization.

1321191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5452 (or 5440 counting only the distinct ones).

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

The square root of 1321191 is about 1149.4307286653. The cubic root of 1321191 is about 109.7291130735.

The spelling of 1321191 in words is "one million, three hundred twenty-one thousand, one hundred ninety-one".