126643291091 has 4 divisors (see below), whose sum is σ = 126644412192. Its totient is φ = 126642169992.

The previous prime is 126643291079. The next prime is 126643291109. The reversal of 126643291091 is 190192346621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 126643291091 - 2¹⁴ = 126643274707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126643291031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369371 + ... + 624276.

It is an arithmetic number, because the mean of its divisors is an integer number (31661103048).

Almost surely, 2^126643291091 is an apocalyptic number.

126643291091 is a deficient number, since it is larger than the sum of its proper divisors (1121101).

126643291091 is an equidigital number, since it uses as much as digits as its factorization.

126643291091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121100.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 126643291091 in words is "one hundred twenty-six billion, six hundred forty-three million, two hundred ninety-one thousand, ninety-one".