129435377 has 2 divisors, whose sum is σ = 129435378. Its totient is φ = 129435376.

The previous prime is 129435359. The next prime is 129435379. The reversal of 129435377 is 773534921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124634896 + 4800481 = 11164^2 + 2191^2 .

It is a cyclic number.

It is not a de Polignac number, because 129435377 - 2²⁰ = 128386801 is a prime.

Together with 129435379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129435379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64717688 + 64717689.

It is an arithmetic number, because the mean of its divisors is an integer number (64717689).

Almost surely, 2^129435377 is an apocalyptic number.

It is an amenable number.

129435377 is a deficient number, since it is larger than the sum of its proper divisors (1).

129435377 is an equidigital number, since it uses as much as digits as its factorization.

129435377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 41.

The square root of 129435377 is about 11376.9669508178. The cubic root of 129435377 is about 505.8452361449.

The spelling of 129435377 in words is "one hundred twenty-nine million, four hundred thirty-five thousand, three hundred seventy-seven".