121313252549 has 2 divisors, whose sum is σ = 121313252550. Its totient is φ = 121313252548.

The previous prime is 121313252539. The next prime is 121313252561. The reversal of 121313252549 is 945252313121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114958293025 + 6354959524 = 339055^2 + 79718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121313252549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121313252539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656626274 + 60656626275.

It is an arithmetic number, because the mean of its divisors is an integer number (60656626275).

Almost surely, 2^121313252549 is an apocalyptic number.

It is an amenable number.

121313252549 is a deficient number, since it is larger than the sum of its proper divisors (1).

121313252549 is an equidigital number, since it uses as much as digits as its factorization.

121313252549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The spelling of 121313252549 in words is "one hundred twenty-one billion, three hundred thirteen million, two hundred fifty-two thousand, five hundred forty-nine".