129317473 has 4 divisors (see below), whose sum is σ = 129408048. Its totient is φ = 129226900.

The previous prime is 129317449. The next prime is 129317497. The reversal of 129317473 is 374713921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 374713921 = 5581 ⋅67141.

It is an interprime number because it is at equal distance from previous prime (129317449) and next prime (129317497).

It is a cyclic number.

It is not a de Polignac number, because 129317473 - 2¹³ = 129309281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129317423) 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, 43111 + ... + 46012.

It is an arithmetic number, because the mean of its divisors is an integer number (32352012).

Almost surely, 2^129317473 is an apocalyptic number.

It is an amenable number.

129317473 is a deficient number, since it is larger than the sum of its proper divisors (90575).

129317473 is an equidigital number, since it uses as much as digits as its factorization.

129317473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90574.

The product of its digits is 31752, while the sum is 37.

The square root of 129317473 is about 11371.7840728709. The cubic root of 129317473 is about 505.6915962964.

The spelling of 129317473 in words is "one hundred twenty-nine million, three hundred seventeen thousand, four hundred seventy-three".