1131491 has 2 divisors, whose sum is σ = 1131492. Its totient is φ = 1131490.

The previous prime is 1131479. The next prime is 1131509. The reversal of 1131491 is 1941311.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131491 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1131421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565745 + 565746.

It is an arithmetic number, because the mean of its divisors is an integer number (565746).

2^1131491 is an apocalyptic number.

1131491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131491 is an equidigital number, since it uses as much as digits as its factorization.

1131491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 20.

The square root of 1131491 is about 1063.7156574950. The cubic root of 1131491 is about 104.2038347008.

The spelling of 1131491 in words is "one million, one hundred thirty-one thousand, four hundred ninety-one".