1331291 has 4 divisors (see below), whose sum is σ = 1433712. Its totient is φ = 1228872.

The previous prime is 1331279. The next prime is 1331293. The reversal of 1331291 is 1921331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1921331 = 71 ⋅27061.

It is a cyclic number.

It is not a de Polignac number, because 1331291 - 2⁶ = 1331227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51191 + ... + 51216.

It is an arithmetic number, because the mean of its divisors is an integer number (358428).

2^1331291 is an apocalyptic number.

1331291 is a deficient number, since it is larger than the sum of its proper divisors (102421).

1331291 is a wasteful number, since it uses less digits than its factorization.

1331291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102420.

The product of its digits is 162, while the sum is 20.

The square root of 1331291 is about 1153.8158431916. The cubic root of 1331291 is about 110.0080159448.

The spelling of 1331291 in words is "one million, three hundred thirty-one thousand, two hundred ninety-one".