29805172889 has 2 divisors, whose sum is σ = 29805172890. Its totient is φ = 29805172888.

The previous prime is 29805172883. The next prime is 29805172913. The reversal of 29805172889 is 98827150892.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29621163664 + 184009225 = 172108^2 + 13565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29805172889 is a prime.

It is not a weakly prime, because it can be changed into another prime (29805172883) by changing a digit.

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 as a sum of consecutive naturals, namely, 14902586444 + 14902586445.

It is an arithmetic number, because the mean of its divisors is an integer number (14902586445).

Almost surely, 2^29805172889 is an apocalyptic number.

It is an amenable number.

29805172889 is a deficient number, since it is larger than the sum of its proper divisors (1).

29805172889 is an equidigital number, since it uses as much as digits as its factorization.

29805172889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 59.

The spelling of 29805172889 in words is "twenty-nine billion, eight hundred five million, one hundred seventy-two thousand, eight hundred eighty-nine".