29991984109 has 2 divisors, whose sum is σ = 29991984110. Its totient is φ = 29991984108.

The previous prime is 29991984097. The next prime is 29991984163. The reversal of 29991984109 is 90148919992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26025755625 + 3966228484 = 161325^2 + 62978^2 .

It is a cyclic number.

It is not a de Polignac number, because 29991984109 - 2¹⁷ = 29991853037 is a prime.

It is a super-2 number, since 2×29991984109² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29991904109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14995992054 + 14995992055.

It is an arithmetic number, because the mean of its divisors is an integer number (14995992055).

Almost surely, 2^29991984109 is an apocalyptic number.

It is an amenable number.

29991984109 is a deficient number, since it is larger than the sum of its proper divisors (1).

29991984109 is an equidigital number, since it uses as much as digits as its factorization.

29991984109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 61.

The spelling of 29991984109 in words is "twenty-nine billion, nine hundred ninety-one million, nine hundred eighty-four thousand, one hundred nine".