121859508577 has 2 divisors, whose sum is σ = 121859508578. Its totient is φ = 121859508576.

The previous prime is 121859508553. The next prime is 121859508607. The reversal of 121859508577 is 775805958121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113822565376 + 8036943201 = 337376^2 + 89649^2 .

It is a cyclic number.

It is not a de Polignac number, because 121859508577 - 2³⁵ = 87499770209 is a prime.

It is not a weakly prime, because it can be changed into another prime (121859500577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60929754288 + 60929754289.

It is an arithmetic number, because the mean of its divisors is an integer number (60929754289).

Almost surely, 2^121859508577 is an apocalyptic number.

It is an amenable number.

121859508577 is a deficient number, since it is larger than the sum of its proper divisors (1).

121859508577 is an equidigital number, since it uses as much as digits as its factorization.

121859508577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056000, while the sum is 58.

It can be divided in two parts, 121859 and 508577, that added together give a square (630436 = 794²).

The spelling of 121859508577 in words is "one hundred twenty-one billion, eight hundred fifty-nine million, five hundred eight thousand, five hundred seventy-seven".