123533231787 has 54 divisors (see below), whose sum is σ = 215324051124. Its totient is φ = 70568502480.

The previous prime is 123533231707. The next prime is 123533231807. The reversal of 123533231787 is 787132335321.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

123533231787 is a `hidden beast` number, since 1 + 2 + 3 + 533 + 2 + 31 + 7 + 87 = 666.

It is not a de Polignac number, because 123533231787 - 2³⁰ = 122459489963 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (123533231707) 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 53 ways as a sum of consecutive naturals, for example, 38350837 + ... + 38354057.

Almost surely, 2^123533231787 is an apocalyptic number.

123533231787 is a deficient number, since it is larger than the sum of its proper divisors (91790819337).

123533231787 is an frugal number, since it uses more digits than its factorization.

123533231787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6471 (or 3231 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The spelling of 123533231787 in words is "one hundred twenty-three billion, five hundred thirty-three million, two hundred thirty-one thousand, seven hundred eighty-seven".