129685345 has 4 divisors (see below), whose sum is σ = 155622420. Its totient is φ = 103748272.

The previous prime is 129685331. The next prime is 129685397. The reversal of 129685345 is 543586921.

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 58721569 + 70963776 = 7663^2 + 8424^2 .

It is a cyclic number.

It is not a de Polignac number, because 129685345 - 2¹¹ = 129683297 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12968530 + ... + 12968539.

It is an arithmetic number, because the mean of its divisors is an integer number (38905605).

Almost surely, 2^129685345 is an apocalyptic number.

It is an amenable number.

129685345 is a deficient number, since it is larger than the sum of its proper divisors (25937075).

129685345 is an equidigital number, since it uses as much as digits as its factorization.

129685345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25937074.

The product of its digits is 259200, while the sum is 43.

The square root of 129685345 is about 11387.9473567452. The cubic root of 129685345 is about 506.1706593134.

The spelling of 129685345 in words is "one hundred twenty-nine million, six hundred eighty-five thousand, three hundred forty-five".