129471973 has 4 divisors (see below), whose sum is σ = 132629868. Its totient is φ = 126314080.

The previous prime is 129471971. The next prime is 129471977. The reversal of 129471973 is 379174921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45603009 + 83868964 = 6753^2 + 9158^2 .

It is a cyclic number.

It is not a de Polignac number, because 129471973 - 2¹ = 129471971 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 (129471971) 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, 1578886 + ... + 1578967.

It is an arithmetic number, because the mean of its divisors is an integer number (33157467).

Almost surely, 2^129471973 is an apocalyptic number.

It is an amenable number.

129471973 is a deficient number, since it is larger than the sum of its proper divisors (3157895).

129471973 is an equidigital number, since it uses as much as digits as its factorization.

129471973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157894.

The product of its digits is 95256, while the sum is 43.

The square root of 129471973 is about 11378.5751744232. The cubic root of 129471973 is about 505.8929051524.

The spelling of 129471973 in words is "one hundred twenty-nine million, four hundred seventy-one thousand, nine hundred seventy-three".