1231304121 has 6 divisors (see below), whose sum is σ = 1778550410. Its totient is φ = 820869408.

The previous prime is 1231304071. The next prime is 1231304141. The reversal of 1231304121 is 1214031321.

1231304121 is a `hidden beast` number, since 123 + 130 + 412 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1134005625 + 97298496 = 33675^2 + 9864^2 .

It is not a de Polignac number, because 1231304121 - 2⁹ = 1231303609 is a prime.

It is a super-2 number, since 2×1231304121² = 3032219676783165282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231304094 and 1231304103.

It is not an unprimeable number, because it can be changed into a prime (1231304141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68405776 + ... + 68405793.

Almost surely, 2^1231304121 is an apocalyptic number.

It is an amenable number.

1231304121 is a deficient number, since it is larger than the sum of its proper divisors (547246289).

1231304121 is a wasteful number, since it uses less digits than its factorization.

1231304121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136811575 (or 136811572 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1231304121 is about 35089.9433028895. The cubic root of 1231304121 is about 1071.8198050622.

Adding to 1231304121 its reverse (1214031321), we get a palindrome (2445335442).

The spelling of 1231304121 in words is "one billion, two hundred thirty-one million, three hundred four thousand, one hundred twenty-one".