129897918937 has 4 divisors (see below), whose sum is σ = 132099578640. Its totient is φ = 127696259236.

The previous prime is 129897918929. The next prime is 129897918947. The reversal of 129897918937 is 739819798921.

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.

It is a cyclic number.

It is not a de Polignac number, because 129897918937 - 2³ = 129897918929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129897918937.

It is not an unprimeable number, because it can be changed into a prime (129897918947) 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, 1100829763 + ... + 1100829880.

It is an arithmetic number, because the mean of its divisors is an integer number (33024894660).

Almost surely, 2^129897918937 is an apocalyptic number.

It is an amenable number.

129897918937 is a deficient number, since it is larger than the sum of its proper divisors (2201659703).

129897918937 is an equidigital number, since it uses as much as digits as its factorization.

129897918937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201659702.

The product of its digits is 123451776, while the sum is 73.

The spelling of 129897918937 in words is "one hundred twenty-nine billion, eight hundred ninety-seven million, nine hundred eighteen thousand, nine hundred thirty-seven".