23173431813 has 24 divisors (see below), whose sum is σ = 38284504128. Its totient is φ = 13231593792.

The previous prime is 23173431811. The next prime is 23173431851. The reversal of 23173431813 is 31813437132.

23173431813 is a `hidden beast` number, since 231 + 7 + 343 + 1 + 81 + 3 = 666.

It is not a de Polignac number, because 23173431813 - 2¹ = 23173431811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23173431811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62520 + ... + 224177.

It is an arithmetic number, because the mean of its divisors is an integer number (1595187672).

Almost surely, 2^23173431813 is an apocalyptic number.

It is an amenable number.

23173431813 is a deficient number, since it is larger than the sum of its proper divisors (15111072315).

23173431813 is a wasteful number, since it uses less digits than its factorization.

23173431813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287993 (or 287990 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

Adding to 23173431813 its reverse (31813437132), we get a palindrome (54986868945).

The spelling of 23173431813 in words is "twenty-three billion, one hundred seventy-three million, four hundred thirty-one thousand, eight hundred thirteen".