129684977 has 4 divisors (see below), whose sum is σ = 130099620. Its totient is φ = 129270336.

The previous prime is 129684953. The next prime is 129685007. The reversal of 129684977 is 779486921.

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 35808256 + 93876721 = 5984^2 + 9689^2 .

It is a cyclic number.

It is not a de Polignac number, because 129684977 - 2⁶ = 129684913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129684077) 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, 206852 + ... + 207477.

It is an arithmetic number, because the mean of its divisors is an integer number (32524905).

Almost surely, 2^129684977 is an apocalyptic number.

It is an amenable number.

129684977 is a deficient number, since it is larger than the sum of its proper divisors (414643).

129684977 is an equidigital number, since it uses as much as digits as its factorization.

129684977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414642.

The product of its digits is 1524096, while the sum is 53.

The square root of 129684977 is about 11387.9311993004. The cubic root of 129684977 is about 506.1701805366.

The spelling of 129684977 in words is "one hundred twenty-nine million, six hundred eighty-four thousand, nine hundred seventy-seven".