1131321113 has 4 divisors (see below), whose sum is σ = 1218345828. Its totient is φ = 1044296400.

The previous prime is 1131321071. The next prime is 1131321127. The reversal of 1131321113 is 3111231311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 524043664 + 607277449 = 22892^2 + 24643^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131321113 - 2¹² = 1131317017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131321091 and 1131321100.

It is not an unprimeable number, because it can be changed into a prime (1131321193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43512338 + ... + 43512363.

It is an arithmetic number, because the mean of its divisors is an integer number (304586457).

Almost surely, 2^1131321113 is an apocalyptic number.

1131321113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1131321113 is a deficient number, since it is larger than the sum of its proper divisors (87024715).

1131321113 is an equidigital number, since it uses as much as digits as its factorization.

1131321113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87024714.

The product of its digits is 54, while the sum is 17.

The square root of 1131321113 is about 33635.1172586034. The cubic root of 1131321113 is about 1041.9861923352.

Adding to 1131321113 its reverse (3111231311), we get a palindrome (4242552424).

The spelling of 1131321113 in words is "one billion, one hundred thirty-one million, three hundred twenty-one thousand, one hundred thirteen".