129223791 has 6 divisors (see below), whose sum is σ = 186656600. Its totient is φ = 86149188.

The previous prime is 129223789. The next prime is 129223799. The reversal of 129223791 is 197322921.

It is not a de Polignac number, because 129223791 - 2¹ = 129223789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129223799) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7179091 + ... + 7179108.

Almost surely, 2^129223791 is an apocalyptic number.

129223791 is a deficient number, since it is larger than the sum of its proper divisors (57432809).

129223791 is a wasteful number, since it uses less digits than its factorization.

129223791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14358205 (or 14358202 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 129223791 is about 11367.6642719602. The cubic root of 129223791 is about 505.5694533679.

The spelling of 129223791 in words is "one hundred twenty-nine million, two hundred twenty-three thousand, seven hundred ninety-one".