121756525481 has 2 divisors, whose sum is σ = 121756525482. Its totient is φ = 121756525480.

The previous prime is 121756525441. The next prime is 121756525483. The reversal of 121756525481 is 184525657121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100399625881 + 21356899600 = 316859^2 + 146140^2 .

It is a cyclic number.

It is not a de Polignac number, because 121756525481 - 2²² = 121752331177 is a prime.

It is a super-2 number, since 2×121756525481² (a number of 23 digits) contains 22 as substring.

Together with 121756525483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121756525483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60878262740 + 60878262741.

It is an arithmetic number, because the mean of its divisors is an integer number (60878262741).

Almost surely, 2^121756525481 is an apocalyptic number.

It is an amenable number.

121756525481 is a deficient number, since it is larger than the sum of its proper divisors (1).

121756525481 is an equidigital number, since it uses as much as digits as its factorization.

121756525481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672000, while the sum is 47.

The spelling of 121756525481 in words is "one hundred twenty-one billion, seven hundred fifty-six million, five hundred twenty-five thousand, four hundred eighty-one".