129877117 has 2 divisors, whose sum is σ = 129877118. Its totient is φ = 129877116.

The previous prime is 129877091. The next prime is 129877169. The reversal of 129877117 is 711778921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66928761 + 62948356 = 8181^2 + 7934^2 .

It is a cyclic number.

It is not a de Polignac number, because 129877117 - 2¹⁹ = 129352829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129877177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64938558 + 64938559.

It is an arithmetic number, because the mean of its divisors is an integer number (64938559).

Almost surely, 2^129877117 is an apocalyptic number.

It is an amenable number.

129877117 is a deficient number, since it is larger than the sum of its proper divisors (1).

129877117 is an equidigital number, since it uses as much as digits as its factorization.

129877117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 43.

The square root of 129877117 is about 11396.3642009195. The cubic root of 129877117 is about 506.4200361207.

The spelling of 129877117 in words is "one hundred twenty-nine million, eight hundred seventy-seven thousand, one hundred seventeen".