1231351434121 has 2 divisors, whose sum is σ = 1231351434122. Its totient is φ = 1231351434120.

The previous prime is 1231351434119. The next prime is 1231351434163. The reversal of 1231351434121 is 1214341531321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142942737225 + 88408696896 = 1069085^2 + 297336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231351434121 - 2¹ = 1231351434119 is a prime.

Together with 1231351434119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1231351434421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615675717060 + 615675717061.

It is an arithmetic number, because the mean of its divisors is an integer number (615675717061).

Almost surely, 2^{1231351434121} is an apocalyptic number.

It is an amenable number.

1231351434121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231351434121 is an equidigital number, since it uses as much as digits as its factorization.

1231351434121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

Adding to 1231351434121 its reverse (1214341531321), we get a palindrome (2445692965442).

The spelling of 1231351434121 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-one million, four hundred thirty-four thousand, one hundred twenty-one".