1131569 has 2 divisors, whose sum is σ = 1131570. Its totient is φ = 1131568.

The previous prime is 1131553. The next prime is 1131617. The reversal of 1131569 is 9651311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1129969 + 1600 = 1063^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131569 - 2⁴ = 1131553 is a prime.

It is a super-2 number, since 2×1131569² = 2560896803522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1131509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565784 + 565785.

It is an arithmetic number, because the mean of its divisors is an integer number (565785).

2^1131569 is an apocalyptic number.

It is an amenable number.

1131569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131569 is an equidigital number, since it uses as much as digits as its factorization.

1131569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 26.

The square root of 1131569 is about 1063.7523207965. The cubic root of 1131569 is about 104.2062290968.

The spelling of 1131569 in words is "one million, one hundred thirty-one thousand, five hundred sixty-nine".