129918797 has 4 divisors (see below), whose sum is σ = 130042080. Its totient is φ = 129795516.

The previous prime is 129918779. The next prime is 129918809. The reversal of 129918797 is 797819921.

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 129918797 - 2¹⁶ = 129853261 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 (129918707) 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, 60047 + ... + 62172.

It is an arithmetic number, because the mean of its divisors is an integer number (32510520).

Almost surely, 2^129918797 is an apocalyptic number.

It is an amenable number.

129918797 is a deficient number, since it is larger than the sum of its proper divisors (123283).

129918797 is a wasteful number, since it uses less digits than its factorization.

129918797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123282.

The product of its digits is 571536, while the sum is 53.

The square root of 129918797 is about 11398.1927076182. The cubic root of 129918797 is about 506.4742035524.

The spelling of 129918797 in words is "one hundred twenty-nine million, nine hundred eighteen thousand, seven hundred ninety-seven".