1231351225121 has 2 divisors, whose sum is σ = 1231351225122. Its totient is φ = 1231351225120.

The previous prime is 1231351225087. The next prime is 1231351225177. The reversal of 1231351225121 is 1215221531321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 798208230625 + 433142994496 = 893425^2 + 658136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231351225121 - 2¹⁸ = 1231350962977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231351227121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615675612560 + 615675612561.

It is an arithmetic number, because the mean of its divisors is an integer number (615675612561).

Almost surely, 2^{1231351225121} is an apocalyptic number.

It is an amenable number.

1231351225121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231351225121 is an equidigital number, since it uses as much as digits as its factorization.

1231351225121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

Adding to 1231351225121 its reverse (1215221531321), we get a palindrome (2446572756442).

The spelling of 1231351225121 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-one million, two hundred twenty-five thousand, one hundred twenty-one".