129601657 has 2 divisors, whose sum is σ = 129601658. Its totient is φ = 129601656.

The previous prime is 129601649. The next prime is 129601673. The reversal of 129601657 is 756106921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76545001 + 53056656 = 8749^2 + 7284^2 .

It is an emirp because it is prime and its reverse (756106921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129601657 - 2³ = 129601649 is a prime.

It is not a weakly prime, because it can be changed into another prime (129601687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64800828 + 64800829.

It is an arithmetic number, because the mean of its divisors is an integer number (64800829).

Almost surely, 2^129601657 is an apocalyptic number.

It is an amenable number.

129601657 is a deficient number, since it is larger than the sum of its proper divisors (1).

129601657 is an equidigital number, since it uses as much as digits as its factorization.

129601657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 129601657 is about 11384.2723526803. The cubic root of 129601657 is about 506.0617559125.

The spelling of 129601657 in words is "one hundred twenty-nine million, six hundred one thousand, six hundred fifty-seven".