29191918689 has 6 divisors (see below), whose sum is σ = 42166104786. Its totient is φ = 19461279120.

The previous prime is 29191918669. The next prime is 29191918703. The reversal of 29191918689 is 98681919192.

29191918689 is a `hidden beast` number, since 291 + 9 + 191 + 86 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18994352400 + 10197566289 = 137820^2 + 100983^2 .

It is not a de Polignac number, because 29191918689 - 2¹⁶ = 29191853153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29191918669) 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 5 ways as a sum of consecutive naturals, for example, 1621773252 + ... + 1621773269.

It is an arithmetic number, because the mean of its divisors is an integer number (7027684131).

Almost surely, 2^29191918689 is an apocalyptic number.

It is an amenable number.

29191918689 is a deficient number, since it is larger than the sum of its proper divisors (12974186097).

29191918689 is a wasteful number, since it uses less digits than its factorization.

29191918689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243546527 (or 3243546524 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 63.

The spelling of 29191918689 in words is "twenty-nine billion, one hundred ninety-one million, nine hundred eighteen thousand, six hundred eighty-nine".