231771541155623 has 4 divisors (see below), whose sum is σ = 264881761320720. Its totient is φ = 198661320990528.

The previous prime is 231771541155613. The next prime is 231771541155659. The reversal of 231771541155623 is 326551145177132.

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 231771541155623 - 2¹⁰ = 231771541154599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231771541155613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16555110082538 + ... + 16555110082551.

It is an arithmetic number, because the mean of its divisors is an integer number (66220440330180).

Almost surely, 2^{231771541155623} is an apocalyptic number.

231771541155623 is a deficient number, since it is larger than the sum of its proper divisors (33110220165097).

231771541155623 is an equidigital number, since it uses as much as digits as its factorization.

231771541155623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33110220165096.

The product of its digits is 5292000, while the sum is 53.

The spelling of 231771541155623 in words is "two hundred thirty-one trillion, seven hundred seventy-one billion, five hundred forty-one million, one hundred fifty-five thousand, six hundred twenty-three".