1131251113 has 4 divisors (see below), whose sum is σ = 1180435968. Its totient is φ = 1082066260.

The previous prime is 1131251081. The next prime is 1131251117. The reversal of 1131251113 is 3111521311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1131251113 - 2⁵ = 1131251081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131251117) 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, 24592393 + ... + 24592438.

It is an arithmetic number, because the mean of its divisors is an integer number (295108992).

Almost surely, 2^1131251113 is an apocalyptic number.

It is an amenable number.

1131251113 is a deficient number, since it is larger than the sum of its proper divisors (49184855).

1131251113 is an equidigital number, since it uses as much as digits as its factorization.

1131251113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49184854.

The product of its digits is 90, while the sum is 19.

The square root of 1131251113 is about 33634.0766634079. The cubic root of 1131251113 is about 1041.9647010784.

Adding to 1131251113 its reverse (3111521311), we get a palindrome (4242772424).

The spelling of 1131251113 in words is "one billion, one hundred thirty-one million, two hundred fifty-one thousand, one hundred thirteen".