123091739917 has 4 divisors (see below), whose sum is σ = 128443554720. Its totient is φ = 117739925116.

The previous prime is 123091739909. The next prime is 123091740017. The reversal of 123091739917 is 719937190321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123091739917 - 2³ = 123091739909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123091739317) 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, 2675907367 + ... + 2675907412.

It is an arithmetic number, because the mean of its divisors is an integer number (32110888680).

Almost surely, 2^123091739917 is an apocalyptic number.

It is an amenable number.

123091739917 is a deficient number, since it is larger than the sum of its proper divisors (5351814803).

123091739917 is an equidigital number, since it uses as much as digits as its factorization.

123091739917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351814802.

The product of its (nonzero) digits is 642978, while the sum is 52.

The spelling of 123091739917 in words is "one hundred twenty-three billion, ninety-one million, seven hundred thirty-nine thousand, nine hundred seventeen".