123717477431 has 4 divisors (see below), whose sum is σ = 126051769512. Its totient is φ = 121383185352.

The previous prime is 123717477421. The next prime is 123717477451. The reversal of 123717477431 is 134774717321.

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

It is a cyclic number.

It is not a de Polignac number, because 123717477431 - 2¹⁸ = 123717215287 is a prime.

It is a super-2 number, since 2×123717477431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123717477421) 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, 1167145961 + ... + 1167146066.

It is an arithmetic number, because the mean of its divisors is an integer number (31512942378).

Almost surely, 2^123717477431 is an apocalyptic number.

123717477431 is a deficient number, since it is larger than the sum of its proper divisors (2334292081).

123717477431 is an equidigital number, since it uses as much as digits as its factorization.

123717477431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334292080.

The product of its digits is 691488, while the sum is 47.

The spelling of 123717477431 in words is "one hundred twenty-three billion, seven hundred seventeen million, four hundred seventy-seven thousand, four hundred thirty-one".