23171786387 has 4 divisors (see below), whose sum is σ = 23199942480. Its totient is φ = 23143630296.

The previous prime is 23171786381. The next prime is 23171786431. The reversal of 23171786387 is 78368717132.

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

It is a cyclic number.

It is not a de Polignac number, because 23171786387 - 2⁴ = 23171786371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23171786381) 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, 14076812 + ... + 14078457.

It is an arithmetic number, because the mean of its divisors is an integer number (5799985620).

Almost surely, 2^23171786387 is an apocalyptic number.

23171786387 is a deficient number, since it is larger than the sum of its proper divisors (28156093).

23171786387 is an equidigital number, since it uses as much as digits as its factorization.

23171786387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28156092.

The product of its digits is 2370816, while the sum is 53.

The spelling of 23171786387 in words is "twenty-three billion, one hundred seventy-one million, seven hundred eighty-six thousand, three hundred eighty-seven".