129126997 has 8 divisors (see below), whose sum is σ = 133443072. Its totient is φ = 124820400.

The previous prime is 129126989. The next prime is 129127007. The reversal of 129126997 is 799621921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129126997 - 2³ = 129126989 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 (129126947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34848 + ... + 38374.

It is an arithmetic number, because the mean of its divisors is an integer number (16680384).

Almost surely, 2^129126997 is an apocalyptic number.

It is an amenable number.

129126997 is a deficient number, since it is larger than the sum of its proper divisors (4316075).

129126997 is a wasteful number, since it uses less digits than its factorization.

129126997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739.

The product of its digits is 122472, while the sum is 46.

The square root of 129126997 is about 11363.4060474842. The cubic root of 129126997 is about 505.4431909804.

The spelling of 129126997 in words is "one hundred twenty-nine million, one hundred twenty-six thousand, nine hundred ninety-seven".