129522473 has 4 divisors (see below), whose sum is σ = 137141460. Its totient is φ = 121903488.

The previous prime is 129522461. The next prime is 129522479. The reversal of 129522473 is 374225921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 374225921 = 15439 ⋅24239.

It can be written as a sum of positive squares in 2 ways, for example, as 121066009 + 8456464 = 11003^2 + 2908^2 .

It is a cyclic number.

It is not a de Polignac number, because 129522473 - 2⁶ = 129522409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129522479) 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, 3809468 + ... + 3809501.

It is an arithmetic number, because the mean of its divisors is an integer number (34285365).

Almost surely, 2^129522473 is an apocalyptic number.

It is an amenable number.

129522473 is a deficient number, since it is larger than the sum of its proper divisors (7618987).

129522473 is an equidigital number, since it uses as much as digits as its factorization.

129522473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7618986.

The product of its digits is 30240, while the sum is 35.

The square root of 129522473 is about 11380.7940408392. The cubic root of 129522473 is about 505.9586704046.

The spelling of 129522473 in words is "one hundred twenty-nine million, five hundred twenty-two thousand, four hundred seventy-three".