129272881 has 2 divisors, whose sum is σ = 129272882. Its totient is φ = 129272880.

The previous prime is 129272873. The next prime is 129272887. The reversal of 129272881 is 188272921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128051856 + 1221025 = 11316^2 + 1105^2 .

It is a cyclic number.

It is not a de Polignac number, because 129272881 - 2³ = 129272873 is a prime.

It is a super-2 number, since 2×129272881² = 33422955524080322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129272887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64636440 + 64636441.

It is an arithmetic number, because the mean of its divisors is an integer number (64636441).

Almost surely, 2^129272881 is an apocalyptic number.

It is an amenable number.

129272881 is a deficient number, since it is larger than the sum of its proper divisors (1).

129272881 is an equidigital number, since it uses as much as digits as its factorization.

129272881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 129272881 is about 11369.8232615991. The cubic root of 129272881 is about 505.6334644458.

Adding to 129272881 its sum of digits (40), we get a palindrome (129272921).

The spelling of 129272881 in words is "one hundred twenty-nine million, two hundred seventy-two thousand, eight hundred eighty-one".