129691029 has 16 divisors (see below), whose sum is σ = 189006272. Its totient is φ = 78617088.

The previous prime is 129691021. The next prime is 129691033. The reversal of 129691029 is 920196921.

It is not a de Polignac number, because 129691029 - 2³ = 129691021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129691021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22204 + ... + 27429.

It is an arithmetic number, because the mean of its divisors is an integer number (11812892).

Almost surely, 2^129691029 is an apocalyptic number.

It is an amenable number.

129691029 is a deficient number, since it is larger than the sum of its proper divisors (59315243).

129691029 is a wasteful number, since it uses less digits than its factorization.

129691029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49716.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 129691029 is about 11388.1969161057. The cubic root of 129691029 is about 506.1780542173.

The spelling of 129691029 in words is "one hundred twenty-nine million, six hundred ninety-one thousand, twenty-nine".