123555403431 has 20 divisors (see below), whose sum is σ = 188052884712. Its totient is φ = 80816110128.

The previous prime is 123555403417. The next prime is 123555403463. The reversal of 123555403431 is 134304555321.

123555403431 is a `hidden beast` number, since 1 + 2 + 3 + 55 + 540 + 34 + 31 = 666.

It is not a de Polignac number, because 123555403431 - 2⁷ = 123555403303 is a prime.

It is a super-2 number, since 2×123555403431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123555402431) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14386041 + ... + 14394626.

Almost surely, 2^123555403431 is an apocalyptic number.

123555403431 is a deficient number, since it is larger than the sum of its proper divisors (64497481281).

123555403431 is an equidigital number, since it uses as much as digits as its factorization.

123555403431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28780732 (or 28780723 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 123555403431 its reverse (134304555321), we get a palindrome (257859958752).

The spelling of 123555403431 in words is "one hundred twenty-three billion, five hundred fifty-five million, four hundred three thousand, four hundred thirty-one".