23138471731 has 4 divisors (see below), whose sum is σ = 23139993600. Its totient is φ = 23136949864.

The previous prime is 23138471717. The next prime is 23138471801. The reversal of 23138471731 is 13717483132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23138471731 is a prime.

It is a super-2 number, since 2×23138471731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23138471711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737896 + ... + 768613.

It is an arithmetic number, because the mean of its divisors is an integer number (5784998400).

Almost surely, 2^23138471731 is an apocalyptic number.

23138471731 is a deficient number, since it is larger than the sum of its proper divisors (1521869).

23138471731 is a wasteful number, since it uses less digits than its factorization.

23138471731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521868.

The product of its digits is 84672, while the sum is 40.

The spelling of 23138471731 in words is "twenty-three billion, one hundred thirty-eight million, four hundred seventy-one thousand, seven hundred thirty-one".