29191921109 has 12 divisors (see below), whose sum is σ = 31625959716. Its totient is φ = 26932943232.

The previous prime is 29191921019. The next prime is 29191921123. The reversal of 29191921109 is 90112919192.

It can be written as a sum of positive squares in 6 ways, for example, as 1092104209 + 28099816900 = 33047^2 + 167630^2 .

It is a de Polignac number, because none of the positive numbers 2^k-29191921109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29191921109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29191921009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 304889 + ... + 389025.

It is an arithmetic number, because the mean of its divisors is an integer number (2635496643).

Almost surely, 2^29191921109 is an apocalyptic number.

It is an amenable number.

29191921109 is a deficient number, since it is larger than the sum of its proper divisors (2434038607).

29191921109 is a wasteful number, since it uses less digits than its factorization.

29191921109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86216 (or 86203 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 44.

The spelling of 29191921109 in words is "twenty-nine billion, one hundred ninety-one million, nine hundred twenty-one thousand, one hundred nine".