816129605 has 8 divisors (see below), whose sum is σ = 980254872. Its totient is φ = 652304128.

The previous prime is 816129583. The next prime is 816129617. The reversal of 816129605 is 506921618.

It can be written as a sum of positive squares in 4 ways, for example, as 1940449 + 814189156 = 1393^2 + 28534^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816129605 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68912 + ... + 79881.

It is an arithmetic number, because the mean of its divisors is an integer number (122531859).

Almost surely, 2^816129605 is an apocalyptic number.

It is an amenable number.

816129605 is a deficient number, since it is larger than the sum of its proper divisors (164125267).

816129605 is a wasteful number, since it uses less digits than its factorization.

816129605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149895.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 816129605 is about 28567.9821653543. The cubic root of 816129605 is about 934.5152166766.

The spelling of 816129605 in words is "eight hundred sixteen million, one hundred twenty-nine thousand, six hundred five".