129446657 has 4 divisors (see below), whose sum is σ = 130271316. Its totient is φ = 128622000.

The previous prime is 129446623. The next prime is 129446663. The reversal of 129446657 is 756644921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90459121 + 38987536 = 9511^2 + 6244^2 .

It is a cyclic number.

It is not a de Polignac number, because 129446657 - 2¹² = 129442561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129446357) 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, 412094 + ... + 412407.

It is an arithmetic number, because the mean of its divisors is an integer number (32567829).

Almost surely, 2^129446657 is an apocalyptic number.

It is an amenable number.

129446657 is a deficient number, since it is larger than the sum of its proper divisors (824659).

129446657 is an equidigital number, since it uses as much as digits as its factorization.

129446657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824658.

The product of its digits is 362880, while the sum is 44.

The square root of 129446657 is about 11377.4626784710. The cubic root of 129446657 is about 505.8599301404.

The spelling of 129446657 in words is "one hundred twenty-nine million, four hundred forty-six thousand, six hundred fifty-seven".