129997877 has 2 divisors, whose sum is σ = 129997878. Its totient is φ = 129997876.

The previous prime is 129997853. The next prime is 129997891. The reversal of 129997877 is 778799921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72829156 + 57168721 = 8534^2 + 7561^2 .

It is an emirp because it is prime and its reverse (778799921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129997877 - 2²⁴ = 113220661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129990877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64998938 + 64998939.

It is an arithmetic number, because the mean of its divisors is an integer number (64998939).

Almost surely, 2^129997877 is an apocalyptic number.

It is an amenable number.

129997877 is a deficient number, since it is larger than the sum of its proper divisors (1).

129997877 is an equidigital number, since it uses as much as digits as its factorization.

129997877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4000752, while the sum is 59.

The square root of 129997877 is about 11401.6611509025. The cubic root of 129997877 is about 506.5769442830.

The spelling of 129997877 in words is "one hundred twenty-nine million, nine hundred ninety-seven thousand, eight hundred seventy-seven".