121954453549 has 2 divisors, whose sum is σ = 121954453550. Its totient is φ = 121954453548.

The previous prime is 121954453459. The next prime is 121954453559. The reversal of 121954453549 is 945354459121.

Together with previous prime (121954453459) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108181788100 + 13772665449 = 328910^2 + 117357^2 .

It is a cyclic number.

It is not a de Polignac number, because 121954453549 - 2¹⁹ = 121953929261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121954453496 and 121954453505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121954453559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60977226774 + 60977226775.

It is an arithmetic number, because the mean of its divisors is an integer number (60977226775).

Almost surely, 2^121954453549 is an apocalyptic number.

It is an amenable number.

121954453549 is a deficient number, since it is larger than the sum of its proper divisors (1).

121954453549 is an equidigital number, since it uses as much as digits as its factorization.

121954453549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888000, while the sum is 52.

The spelling of 121954453549 in words is "one hundred twenty-one billion, nine hundred fifty-four million, four hundred fifty-three thousand, five hundred forty-nine".