121687250569 has 2 divisors, whose sum is σ = 121687250570. Its totient is φ = 121687250568.

The previous prime is 121687250543. The next prime is 121687250579. The reversal of 121687250569 is 965052786121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120190489225 + 1496761344 = 346685^2 + 38688^2 .

It is a cyclic number.

It is not a de Polignac number, because 121687250569 - 2⁷ = 121687250441 is a prime.

It is a super-2 number, since 2×121687250569² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121687250579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60843625284 + 60843625285.

It is an arithmetic number, because the mean of its divisors is an integer number (60843625285).

Almost surely, 2^121687250569 is an apocalyptic number.

It is an amenable number.

121687250569 is a deficient number, since it is larger than the sum of its proper divisors (1).

121687250569 is an equidigital number, since it uses as much as digits as its factorization.

121687250569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 121687250569 in words is "one hundred twenty-one billion, six hundred eighty-seven million, two hundred fifty thousand, five hundred sixty-nine".