129033977 has 4 divisors (see below), whose sum is σ = 129474660. Its totient is φ = 128593296.

The previous prime is 129033973. The next prime is 129033991. The reversal of 129033977 is 779330921.

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 56715961 + 72318016 = 7531^2 + 8504^2 .

It is a cyclic number.

It is not a de Polignac number, because 129033977 - 2² = 129033973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129033973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219902 + ... + 220487.

It is an arithmetic number, because the mean of its divisors is an integer number (32368665).

Almost surely, 2^129033977 is an apocalyptic number.

It is an amenable number.

129033977 is a deficient number, since it is larger than the sum of its proper divisors (440683).

129033977 is an equidigital number, since it uses as much as digits as its factorization.

129033977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440682.

The product of its (nonzero) digits is 71442, while the sum is 41.

The square root of 129033977 is about 11359.3123471450. The cubic root of 129033977 is about 505.3217920965.

The spelling of 129033977 in words is "one hundred twenty-nine million, thirty-three thousand, nine hundred seventy-seven".