1131320609 has 2 divisors, whose sum is σ = 1131320610. Its totient is φ = 1131320608.

The previous prime is 1131320581. The next prime is 1131320611. The reversal of 1131320609 is 9060231311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 797893009 + 333427600 = 28247^2 + 18260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131320609 is a prime.

Together with 1131320611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1131320689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565660304 + 565660305.

It is an arithmetic number, because the mean of its divisors is an integer number (565660305).

Almost surely, 2^1131320609 is an apocalyptic number.

It is an amenable number.

1131320609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131320609 is an equidigital number, since it uses as much as digits as its factorization.

1131320609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1131320609 is about 33635.1097664331. The cubic root of 1131320609 is about 1041.9860376014.

The spelling of 1131320609 in words is "one billion, one hundred thirty-one million, three hundred twenty thousand, six hundred nine".