129220257 has 8 divisors (see below), whose sum is σ = 174229920. Its totient is φ = 85178720.

The previous prime is 129220253. The next prime is 129220261. The reversal of 129220257 is 752022921.

It is an interprime number because it is at equal distance from previous prime (129220253) and next prime (129220261).

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 129220257 - 2² = 129220253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129220253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241719 + ... + 242252.

It is an arithmetic number, because the mean of its divisors is an integer number (21778740).

Almost surely, 2^129220257 is an apocalyptic number.

It is an amenable number.

129220257 is a deficient number, since it is larger than the sum of its proper divisors (45009663).

129220257 is an equidigital number, since it uses as much as digits as its factorization.

129220257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484063.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 129220257 is about 11367.5088299944. The cubic root of 129220257 is about 505.5648445707.

The spelling of 129220257 in words is "one hundred twenty-nine million, two hundred twenty thousand, two hundred fifty-seven".