29115620689 has 3 divisors (see below), whose sum is σ = 29115791323. Its totient is φ = 29115450056.

The previous prime is 29115620671. The next prime is 29115620717. The reversal of 29115620689 is 98602651192.

The square root of 29115620689 is 170633.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 29071955025 + 43665664 = 170505^2 + 6608^2 .

It is not a de Polignac number, because 29115620689 - 2⁵ = 29115620657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29115620659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 85317 + ... + 255949.

Almost surely, 2^29115620689 is an apocalyptic number.

29115620689 is the 170633-rd square number.

29115620689 is the 85317-th centered octagonal number.

It is an amenable number.

29115620689 is a deficient number, since it is larger than the sum of its proper divisors (170634).

29115620689 is an frugal number, since it uses more digits than its factorization.

29115620689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341266 (or 170633 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

Multiplying 29115620689 by its sum of digits (49), we get a square (1426665413761 = 1194431²).

The spelling of 29115620689 in words is "twenty-nine billion, one hundred fifteen million, six hundred twenty thousand, six hundred eighty-nine".