129689229 has 4 divisors (see below), whose sum is σ = 172918976. Its totient is φ = 86459484.

The previous prime is 129689227. The next prime is 129689281. The reversal of 129689229 is 922986921.

It is a happy number.

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.

It is not a de Polignac number, because 129689229 - 2¹ = 129689227 is a prime.

It is a super-2 number, since 2×129689229² = 33638592237228882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129689221) 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, 21614869 + ... + 21614874.

It is an arithmetic number, because the mean of its divisors is an integer number (43229744).

Almost surely, 2^129689229 is an apocalyptic number.

It is an amenable number.

129689229 is a deficient number, since it is larger than the sum of its proper divisors (43229747).

129689229 is an equidigital number, since it uses as much as digits as its factorization.

129689229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43229746.

The product of its digits is 279936, while the sum is 48.

The square root of 129689229 is about 11388.1178866396. The cubic root of 129689229 is about 506.1757124344.

It can be divided in two parts, 1296892 and 29, that added together give a palindrome (1296921).

The spelling of 129689229 in words is "one hundred twenty-nine million, six hundred eighty-nine thousand, two hundred twenty-nine".