129137377 has 4 divisors (see below), whose sum is σ = 133590420. Its totient is φ = 124684336.

The previous prime is 129137369. The next prime is 129137381. The reversal of 129137377 is 773731921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78428736 + 50708641 = 8856^2 + 7121^2 .

It is a cyclic number.

It is not a de Polignac number, because 129137377 - 2³ = 129137369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129137317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2226478 + ... + 2226535.

It is an arithmetic number, because the mean of its divisors is an integer number (33397605).

Almost surely, 2^129137377 is an apocalyptic number.

It is an amenable number.

129137377 is a deficient number, since it is larger than the sum of its proper divisors (4453043).

129137377 is an equidigital number, since it uses as much as digits as its factorization.

129137377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4453042.

The product of its digits is 55566, while the sum is 40.

The square root of 129137377 is about 11363.8627675628. The cubic root of 129137377 is about 505.4567341326.

The spelling of 129137377 in words is "one hundred twenty-nine million, one hundred thirty-seven thousand, three hundred seventy-seven".