129889657 has 4 divisors (see below), whose sum is σ = 129917776. Its totient is φ = 129861540.

The previous prime is 129889649. The next prime is 129889687. The reversal of 129889657 is 756988921.

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 129889657 - 2³ = 129889649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129889598 and 129889607.

It is not an unprimeable number, because it can be changed into a prime (129889607) 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, 5319 + ... + 16972.

It is an arithmetic number, because the mean of its divisors is an integer number (32479444).

Almost surely, 2^129889657 is an apocalyptic number.

It is an amenable number.

129889657 is a deficient number, since it is larger than the sum of its proper divisors (28119).

129889657 is an equidigital number, since it uses as much as digits as its factorization.

129889657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28118.

The product of its digits is 2177280, while the sum is 55.

The square root of 129889657 is about 11396.9143631072. The cubic root of 129889657 is about 506.4363343546.

The spelling of 129889657 in words is "one hundred twenty-nine million, eight hundred eighty-nine thousand, six hundred fifty-seven".