129686465 has 4 divisors (see below), whose sum is σ = 155623764. Its totient is φ = 103749168.

The previous prime is 129686449. The next prime is 129686477. The reversal of 129686465 is 564686921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564686921 = 67 ⋅8428163.

It can be written as a sum of positive squares in 2 ways, for example, as 35188624 + 94497841 = 5932^2 + 9721^2 .

It is a cyclic number.

It is not a de Polignac number, because 129686465 - 2⁴ = 129686449 is a prime.

It is a Duffinian number.

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, 12968642 + ... + 12968651.

It is an arithmetic number, because the mean of its divisors is an integer number (38905941).

Almost surely, 2^129686465 is an apocalyptic number.

It is an amenable number.

129686465 is a deficient number, since it is larger than the sum of its proper divisors (25937299).

129686465 is an equidigital number, since it uses as much as digits as its factorization.

129686465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25937298.

The product of its digits is 622080, while the sum is 47.

The square root of 129686465 is about 11387.9965314361. The cubic root of 129686465 is about 506.1721164544.

The spelling of 129686465 in words is "one hundred twenty-nine million, six hundred eighty-six thousand, four hundred sixty-five".