129820711 has 4 divisors (see below), whose sum is σ = 136653400. Its totient is φ = 122988024.

The previous prime is 129820703. The next prime is 129820729. The reversal of 129820711 is 117028921.

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

It is a cyclic number.

It is not a de Polignac number, because 129820711 - 2³ = 129820703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129820771) 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, 3416316 + ... + 3416353.

It is an arithmetic number, because the mean of its divisors is an integer number (34163350).

Almost surely, 2^129820711 is an apocalyptic number.

129820711 is a deficient number, since it is larger than the sum of its proper divisors (6832689).

129820711 is an equidigital number, since it uses as much as digits as its factorization.

129820711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6832688.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 129820711 is about 11393.8891955293. The cubic root of 129820711 is about 506.3467122858.

The spelling of 129820711 in words is "one hundred twenty-nine million, eight hundred twenty thousand, seven hundred eleven".