133123556309981 has 2 divisors, whose sum is σ = 133123556309982. Its totient is φ = 133123556309980.

The previous prime is 133123556309917. The next prime is 133123556309987. The reversal of 133123556309981 is 189903655321331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127764025725625 + 5359530584356 = 11303275^2 + 2315066^2 .

It is a cyclic number.

It is not a de Polignac number, because 133123556309981 - 2⁶ = 133123556309917 is a prime.

It is a super-2 number, since 2×133123556309981² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133123556309981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133123556309987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66561778154990 + 66561778154991.

It is an arithmetic number, because the mean of its divisors is an integer number (66561778154991).

Almost surely, 2^{133123556309981} is an apocalyptic number.

It is an amenable number.

133123556309981 is a deficient number, since it is larger than the sum of its proper divisors (1).

133123556309981 is an equidigital number, since it uses as much as digits as its factorization.

133123556309981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15746400, while the sum is 59.

The spelling of 133123556309981 in words is "one hundred thirty-three trillion, one hundred twenty-three billion, five hundred fifty-six million, three hundred nine thousand, nine hundred eighty-one".