1131320661 has 8 divisors (see below), whose sum is σ = 1530941664. Its totient is φ = 742956720.

The previous prime is 1131320623. The next prime is 1131320681. The reversal of 1131320661 is 1660231311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1131320661 - 2⁹ = 1131320149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131320611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2814030 + ... + 2814431.

It is an arithmetic number, because the mean of its divisors is an integer number (191367708).

Almost surely, 2^1131320661 is an apocalyptic number.

It is an amenable number.

1131320661 is a deficient number, since it is larger than the sum of its proper divisors (399621003).

1131320661 is an equidigital number, since it uses as much as digits as its factorization.

1131320661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628531.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1131320661 is about 33635.1105394348. The cubic root of 1131320661 is about 1041.9860535660.

Adding to 1131320661 its reverse (1660231311), we get a palindrome (2791551972).

The spelling of 1131320661 in words is "one billion, one hundred thirty-one million, three hundred twenty thousand, six hundred sixty-one".