123781923391 has 8 divisors (see below), whose sum is σ = 142923458720. Its totient is φ = 105004988928.

The previous prime is 123781923371. The next prime is 123781923403. The reversal of 123781923391 is 193329187321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123781923391 - 2²¹ = 123779826239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123781923301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91149486 + ... + 91150843.

It is an arithmetic number, because the mean of its divisors is an integer number (17865432340).

Almost surely, 2^123781923391 is an apocalyptic number.

123781923391 is a deficient number, since it is larger than the sum of its proper divisors (19141535329).

123781923391 is an equidigital number, since it uses as much as digits as its factorization.

123781923391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182300433.

The product of its digits is 489888, while the sum is 49.

The spelling of 123781923391 in words is "one hundred twenty-three billion, seven hundred eighty-one million, nine hundred twenty-three thousand, three hundred ninety-one".