10991991029 has 2 divisors, whose sum is σ = 10991991030. Its totient is φ = 10991991028.

The previous prime is 10991990983. The next prime is 10991991037. The reversal of 10991991029 is 92019919901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9801396004 + 1190595025 = 99002^2 + 34505^2 .

It is a cyclic number.

It is not a de Polignac number, because 10991991029 - 2²⁰ = 10990942453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10991991089) 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 as a sum of consecutive naturals, namely, 5495995514 + 5495995515.

It is an arithmetic number, because the mean of its divisors is an integer number (5495995515).

Almost surely, 2^10991991029 is an apocalyptic number.

It is an amenable number.

10991991029 is a deficient number, since it is larger than the sum of its proper divisors (1).

10991991029 is an equidigital number, since it uses as much as digits as its factorization.

10991991029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118098, while the sum is 50.

The spelling of 10991991029 in words is "ten billion, nine hundred ninety-one million, nine hundred ninety-one thousand, twenty-nine".