123117282531 has 20 divisors (see below), whose sum is σ = 188193060792. Its totient is φ = 80169391008.

The previous prime is 123117282523. The next prime is 123117282557. The reversal of 123117282531 is 135282711321.

123117282531 is a `hidden beast` number, since 1 + 2 + 3 + 117 + 2 + 8 + 2 + 531 = 666.

It is not a de Polignac number, because 123117282531 - 2³ = 123117282523 is a prime.

It is a super-2 number, since 2×123117282531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123117282511) 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 19 ways as a sum of consecutive naturals, for example, 17670546 + ... + 17677511.

Almost surely, 2^123117282531 is an apocalyptic number.

123117282531 is a deficient number, since it is larger than the sum of its proper divisors (65075778261).

123117282531 is an equidigital number, since it uses as much as digits as its factorization.

123117282531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35348112 (or 35348103 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

Adding to 123117282531 its reverse (135282711321), we get a palindrome (258399993852).

The spelling of 123117282531 in words is "one hundred twenty-three billion, one hundred seventeen million, two hundred eighty-two thousand, five hundred thirty-one".