129251423 has 4 divisors (see below), whose sum is σ = 147715920. Its totient is φ = 110786928.

The previous prime is 129251413. The next prime is 129251429. The reversal of 129251423 is 324152921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324152921 = 13241 ⋅24481.

It is not a de Polignac number, because 129251423 - 2¹⁸ = 128989279 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 (129251429) 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, 9232238 + ... + 9232251.

It is an arithmetic number, because the mean of its divisors is an integer number (36928980).

Almost surely, 2^129251423 is an apocalyptic number.

129251423 is a deficient number, since it is larger than the sum of its proper divisors (18464497).

129251423 is an equidigital number, since it uses as much as digits as its factorization.

129251423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18464496.

The product of its digits is 4320, while the sum is 29.

The square root of 129251423 is about 11368.8795841983. The cubic root of 129251423 is about 505.6054862053.

The spelling of 129251423 in words is "one hundred twenty-nine million, two hundred fifty-one thousand, four hundred twenty-three".