129312997 has 16 divisors (see below), whose sum is σ = 149022720. Its totient is φ = 111106800.

The previous prime is 129312991. The next prime is 129313007. The reversal of 129312997 is 799213921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129312997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129312991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10254 + ... + 19072.

It is an arithmetic number, because the mean of its divisors is an integer number (9313920).

Almost surely, 2^129312997 is an apocalyptic number.

It is an amenable number.

129312997 is a deficient number, since it is larger than the sum of its proper divisors (19709723).

129312997 is a wasteful number, since it uses less digits than its factorization.

129312997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8904.

The product of its digits is 61236, while the sum is 43.

The square root of 129312997 is about 11371.5872682753. The cubic root of 129312997 is about 505.6857618136.

The spelling of 129312997 in words is "one hundred twenty-nine million, three hundred twelve thousand, nine hundred ninety-seven".