1231122113 has 4 divisors (see below), whose sum is σ = 1325823828. Its totient is φ = 1136420400.

The previous prime is 1231122097. The next prime is 1231122187. The reversal of 1231122113 is 3112211321.

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 84419344 + 1146702769 = 9188^2 + 33863^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231122113 - 2⁴ = 1231122097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231122091 and 1231122100.

It is not an unprimeable number, because it can be changed into a prime (1231127113) 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, 47350838 + ... + 47350863.

It is an arithmetic number, because the mean of its divisors is an integer number (331455957).

Almost surely, 2^1231122113 is an apocalyptic number.

1231122113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1231122113 is a deficient number, since it is larger than the sum of its proper divisors (94701715).

1231122113 is an equidigital number, since it uses as much as digits as its factorization.

1231122113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94701714.

The product of its digits is 72, while the sum is 17.

The square root of 1231122113 is about 35087.3497574268. The cubic root of 1231122113 is about 1071.7669913046.

Adding to 1231122113 its reverse (3112211321), we get a palindrome (4343333434).

The spelling of 1231122113 in words is "one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred thirteen".