129689633 has 4 divisors (see below), whose sum is σ = 129714480. Its totient is φ = 129664788.

The previous prime is 129689629. The next prime is 129689657. The reversal of 129689633 is 336986921.

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 a cyclic number.

It is not a de Polignac number, because 129689633 - 2² = 129689629 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129689533) 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, 1235 + ... + 16152.

It is an arithmetic number, because the mean of its divisors is an integer number (32428620).

Almost surely, 2^129689633 is an apocalyptic number.

It is an amenable number.

129689633 is a deficient number, since it is larger than the sum of its proper divisors (24847).

129689633 is an equidigital number, since it uses as much as digits as its factorization.

129689633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24846.

The product of its digits is 419904, while the sum is 47.

The square root of 129689633 is about 11388.1356244119. The cubic root of 129689633 is about 506.1762380364.

The spelling of 129689633 in words is "one hundred twenty-nine million, six hundred eighty-nine thousand, six hundred thirty-three".