1231121334437 has 2 divisors, whose sum is σ = 1231121334438. Its totient is φ = 1231121334436.

The previous prime is 1231121334409. The next prime is 1231121334451. The reversal of 1231121334437 is 7344331211321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 946590839041 + 284530495396 = 972929^2 + 533414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231121334437 - 2³² = 1226826367141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231121334397 and 1231121334406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231121336437) 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, 615560667218 + 615560667219.

It is an arithmetic number, because the mean of its divisors is an integer number (615560667219).

Almost surely, 2^{1231121334437} is an apocalyptic number.

It is an amenable number.

1231121334437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231121334437 is an equidigital number, since it uses as much as digits as its factorization.

1231121334437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 35.

Adding to 1231121334437 its reverse (7344331211321), we get a palindrome (8575452545758).

The spelling of 1231121334437 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-one million, three hundred thirty-four thousand, four hundred thirty-seven".