123732617491 has 6 divisors (see below), whose sum is σ = 143933861220. Its totient is φ = 106056529236.

The previous prime is 123732617443. The next prime is 123732617549. The reversal of 123732617491 is 194716237321.

It is not a de Polignac number, because 123732617491 - 2⁷ = 123732617363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123732617191) 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 5 ways as a sum of consecutive naturals, for example, 1262577681 + ... + 1262577778.

It is an arithmetic number, because the mean of its divisors is an integer number (23988976870).

Almost surely, 2^123732617491 is an apocalyptic number.

123732617491 is a deficient number, since it is larger than the sum of its proper divisors (20201243729).

123732617491 is an equidigital number, since it uses as much as digits as its factorization.

123732617491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525155473 (or 2525155466 counting only the distinct ones).

The product of its digits is 381024, while the sum is 46.

The spelling of 123732617491 in words is "one hundred twenty-three billion, seven hundred thirty-two million, six hundred seventeen thousand, four hundred ninety-one".