231781998323 has 2 divisors, whose sum is σ = 231781998324. Its totient is φ = 231781998322.

The previous prime is 231781998319. The next prime is 231781998361. The reversal of 231781998323 is 323899187132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231781998323 - 2² = 231781998319 is a prime.

It is not a weakly prime, because it can be changed into another prime (231781998023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115890999161 + 115890999162.

It is an arithmetic number, because the mean of its divisors is an integer number (115890999162).

Almost surely, 2^231781998323 is an apocalyptic number.

231781998323 is a deficient number, since it is larger than the sum of its proper divisors (1).

231781998323 is an equidigital number, since it uses as much as digits as its factorization.

231781998323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 56.

It can be divided in two parts, 2317819 and 98323, that added together give a palindrome (2416142).

The spelling of 231781998323 in words is "two hundred thirty-one billion, seven hundred eighty-one million, nine hundred ninety-eight thousand, three hundred twenty-three".