1231051113 has 12 divisors (see below), whose sum is σ = 1778728068. Its totient is φ = 820450080.

The previous prime is 1231051109. The next prime is 1231051121. The reversal of 1231051113 is 3111501321.

It can be written as a sum of positive squares in 2 ways, for example, as 791184384 + 439866729 = 28128^2 + 20973^2 .

It is not a de Polignac number, because 1231051113 - 2² = 1231051109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231051163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13131 + ... + 51327.

It is an arithmetic number, because the mean of its divisors is an integer number (148227339).

Almost surely, 2^1231051113 is an apocalyptic number.

It is an amenable number.

1231051113 is a deficient number, since it is larger than the sum of its proper divisors (547676955).

1231051113 is a wasteful number, since it uses less digits than its factorization.

1231051113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41784 (or 41781 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1231051113 is about 35086.3379821833. The cubic root of 1231051113 is about 1071.7463876297.

Adding to 1231051113 its reverse (3111501321), we get a palindrome (4342552434).

The spelling of 1231051113 in words is "one billion, two hundred thirty-one million, fifty-one thousand, one hundred thirteen".