121451555447 has 2 divisors, whose sum is σ = 121451555448. Its totient is φ = 121451555446.

The previous prime is 121451555443. The next prime is 121451555521. The reversal of 121451555447 is 744555154121.

It is a weak prime.

It is an emirp because it is prime and its reverse (744555154121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121451555447 - 2² = 121451555443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121451555398 and 121451555407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121451555443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60725777723 + 60725777724.

It is an arithmetic number, because the mean of its divisors is an integer number (60725777724).

Almost surely, 2^121451555447 is an apocalyptic number.

121451555447 is a deficient number, since it is larger than the sum of its proper divisors (1).

121451555447 is an equidigital number, since it uses as much as digits as its factorization.

121451555447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 560000, while the sum is 44.

The spelling of 121451555447 in words is "one hundred twenty-one billion, four hundred fifty-one million, five hundred fifty-five thousand, four hundred forty-seven".