231727981117 has 2 divisors, whose sum is σ = 231727981118. Its totient is φ = 231727981116.

The previous prime is 231727981039. The next prime is 231727981141. The reversal of 231727981117 is 711189727132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133696997316 + 98030983801 = 365646^2 + 313099^2 .

It is a cyclic number.

It is not a de Polignac number, because 231727981117 - 2²³ = 231719592509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231727981157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115863990558 + 115863990559.

It is an arithmetic number, because the mean of its divisors is an integer number (115863990559).

Almost surely, 2^231727981117 is an apocalyptic number.

It is an amenable number.

231727981117 is a deficient number, since it is larger than the sum of its proper divisors (1).

231727981117 is an equidigital number, since it uses as much as digits as its factorization.

231727981117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 49.

The spelling of 231727981117 in words is "two hundred thirty-one billion, seven hundred twenty-seven million, nine hundred eighty-one thousand, one hundred seventeen".