129890631 has 16 divisors (see below), whose sum is σ = 196327040. Its totient is φ = 75725280.

The previous prime is 129890611. The next prime is 129890633. The reversal of 129890631 is 136098921.

It is not a de Polignac number, because 129890631 - 2⁶ = 129890567 is a prime.

It is a super-2 number, since 2×129890631² = 33743152043156322, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 129890631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129890633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86905 + ... + 88386.

It is an arithmetic number, because the mean of its divisors is an integer number (12270440).

Almost surely, 2^129890631 is an apocalyptic number.

129890631 is a deficient number, since it is larger than the sum of its proper divisors (66436409).

129890631 is a wasteful number, since it uses less digits than its factorization.

129890631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175326.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 129890631 is about 11396.9570938913. The cubic root of 129890631 is about 506.4376002182.

The spelling of 129890631 in words is "one hundred twenty-nine million, eight hundred ninety thousand, six hundred thirty-one".