23709531823 has 4 divisors (see below), whose sum is σ = 24260916328. Its totient is φ = 23158147320.

The previous prime is 23709531773. The next prime is 23709531851. The reversal of 23709531823 is 32813590732.

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-23709531823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 551384461 = 23709531823 / (2 + 3 + 7 + 0 + 9 + 5 + 3 + 1 + 8 + 2 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23709531823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23709531863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275692188 + ... + 275692273.

It is an arithmetic number, because the mean of its divisors is an integer number (6065229082).

Almost surely, 2^23709531823 is an apocalyptic number.

23709531823 is a deficient number, since it is larger than the sum of its proper divisors (551384505).

23709531823 is an equidigital number, since it uses as much as digits as its factorization.

23709531823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551384504.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 23709531823 in words is "twenty-three billion, seven hundred nine million, five hundred thirty-one thousand, eight hundred twenty-three".