129255881 has 2 divisors, whose sum is σ = 129255882. Its totient is φ = 129255880.

The previous prime is 129255869. The next prime is 129255937. The reversal of 129255881 is 188552921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92544400 + 36711481 = 9620^2 + 6059^2 .

It is an emirp because it is prime and its reverse (188552921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129255881 - 2¹⁸ = 128993737 is a prime.

It is a super-2 number, since 2×129255881² = 33414165546172322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (129255481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64627940 + 64627941.

It is an arithmetic number, because the mean of its divisors is an integer number (64627941).

Almost surely, 2^129255881 is an apocalyptic number.

It is an amenable number.

129255881 is a deficient number, since it is larger than the sum of its proper divisors (1).

129255881 is an equidigital number, since it uses as much as digits as its factorization.

129255881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 41.

The square root of 129255881 is about 11369.0756440442. The cubic root of 129255881 is about 505.6112990706.

The spelling of 129255881 in words is "one hundred twenty-nine million, two hundred fifty-five thousand, eight hundred eighty-one".