129069429 has 4 divisors (see below), whose sum is σ = 172092576. Its totient is φ = 86046284.

The previous prime is 129069427. The next prime is 129069443. The reversal of 129069429 is 924960921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 924960921 = 3 ⋅308320307.

It is a cyclic number.

It is not a de Polignac number, because 129069429 - 2¹ = 129069427 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129069427) 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, 21511569 + ... + 21511574.

It is an arithmetic number, because the mean of its divisors is an integer number (43023144).

Almost surely, 2^129069429 is an apocalyptic number.

It is an amenable number.

129069429 is a deficient number, since it is larger than the sum of its proper divisors (43023147).

129069429 is an equidigital number, since it uses as much as digits as its factorization.

129069429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43023146.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 129069429 is about 11360.8727217587. The cubic root of 129069429 is about 505.3680668017.

The spelling of 129069429 in words is "one hundred twenty-nine million, sixty-nine thousand, four hundred twenty-nine".