122120187447689 has 2 divisors, whose sum is σ = 122120187447690. Its totient is φ = 122120187447688.

The previous prime is 122120187447611. The next prime is 122120187447691. The reversal of 122120187447689 is 986744781021221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72804119396089 + 49316068051600 = 8532533^2 + 7022540^2 .

It is a cyclic number.

It is not a de Polignac number, because 122120187447689 - 2²⁴ = 122120170670473 is a prime.

It is a super-2 number, since 2×122120187447689² (a number of 29 digits) contains 22 as substring.

Together with 122120187447691, 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 (122120187447289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61060093723844 + 61060093723845.

It is an arithmetic number, because the mean of its divisors is an integer number (61060093723845).

Almost surely, 2^{122120187447689} is an apocalyptic number.

It is an amenable number.

122120187447689 is a deficient number, since it is larger than the sum of its proper divisors (1).

122120187447689 is an equidigital number, since it uses as much as digits as its factorization.

122120187447689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21676032, while the sum is 62.

The spelling of 122120187447689 in words is "one hundred twenty-two trillion, one hundred twenty billion, one hundred eighty-seven million, four hundred forty-seven thousand, six hundred eighty-nine".