1331091 has 12 divisors (see below), whose sum is σ = 1939080. Its totient is φ = 879840.

The previous prime is 1331063. The next prime is 1331093. The reversal of 1331091 is 1901331.

It is not a de Polignac number, because 1331091 - 2⁵ = 1331059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331093) 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 11 ways as a sum of consecutive naturals, for example, 615 + ... + 1743.

It is an arithmetic number, because the mean of its divisors is an integer number (161590).

2^1331091 is an apocalyptic number.

1331091 is a deficient number, since it is larger than the sum of its proper divisors (607989).

1331091 is a wasteful number, since it uses less digits than its factorization.

1331091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

The square root of 1331091 is about 1153.7291709929. The cubic root of 1331091 is about 110.0025068299.

The spelling of 1331091 in words is "one million, three hundred thirty-one thousand, ninety-one".