129822865 has 4 divisors (see below), whose sum is σ = 155787444. Its totient is φ = 103858288.

The previous prime is 129822859. The next prime is 129822871. The reversal of 129822865 is 568228921.

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

It is an interprime number because it is at equal distance from previous prime (129822859) and next prime (129822871).

It can be written as a sum of positive squares in 2 ways, for example, as 29582721 + 100240144 = 5439^2 + 10012^2 .

It is a cyclic number.

It is not a de Polignac number, because 129822865 - 2³ = 129822857 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12982282 + ... + 12982291.

It is an arithmetic number, because the mean of its divisors is an integer number (38946861).

Almost surely, 2^129822865 is an apocalyptic number.

It is an amenable number.

129822865 is a deficient number, since it is larger than the sum of its proper divisors (25964579).

129822865 is an equidigital number, since it uses as much as digits as its factorization.

129822865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25964578.

The product of its digits is 138240, while the sum is 43.

The square root of 129822865 is about 11393.9837194899. The cubic root of 129822865 is about 506.3495127244.

The spelling of 129822865 in words is "one hundred twenty-nine million, eight hundred twenty-two thousand, eight hundred sixty-five".