129643631 has 8 divisors (see below), whose sum is σ = 146964720. Its totient is φ = 113372352.

The previous prime is 129643627. The next prime is 129643637. The reversal of 129643631 is 136346921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129643631 - 2² = 129643627 is a prime.

It is a super-2 number, since 2×129643631² = 33614942117728322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129643591 and 129643600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129643637) 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 7 ways as a sum of consecutive naturals, for example, 262190 + ... + 262683.

It is an arithmetic number, because the mean of its divisors is an integer number (18370590).

Almost surely, 2^129643631 is an apocalyptic number.

129643631 is a deficient number, since it is larger than the sum of its proper divisors (17321089).

129643631 is a wasteful number, since it uses less digits than its factorization.

129643631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524905.

The product of its digits is 23328, while the sum is 35.

The square root of 129643631 is about 11386.1157116903. The cubic root of 129643631 is about 506.1163826405.

The spelling of 129643631 in words is "one hundred twenty-nine million, six hundred forty-three thousand, six hundred thirty-one".