123191634243 has 4 divisors (see below), whose sum is σ = 164255512328. Its totient is φ = 82127756160.

The previous prime is 123191634197. The next prime is 123191634271. The reversal of 123191634243 is 342436191321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123191634243 - 2¹² = 123191630147 is a prime.

It is a super-2 number, since 2×123191634243² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123191634283) 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 3 ways as a sum of consecutive naturals, for example, 20531939038 + ... + 20531939043.

It is an arithmetic number, because the mean of its divisors is an integer number (41063878082).

Almost surely, 2^123191634243 is an apocalyptic number.

123191634243 is a deficient number, since it is larger than the sum of its proper divisors (41063878085).

123191634243 is an equidigital number, since it uses as much as digits as its factorization.

123191634243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41063878084.

The product of its digits is 93312, while the sum is 39.

The spelling of 123191634243 in words is "one hundred twenty-three billion, one hundred ninety-one million, six hundred thirty-four thousand, two hundred forty-three".