231997547773 has 2 divisors, whose sum is σ = 231997547774. Its totient is φ = 231997547772.

The previous prime is 231997547681. The next prime is 231997547779. The reversal of 231997547773 is 377745799132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184175730649 + 47821817124 = 429157^2 + 218682^2 .

It is a cyclic number.

It is not a de Polignac number, because 231997547773 - 2⁹ = 231997547261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231997547779) 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 as a sum of consecutive naturals, namely, 115998773886 + 115998773887.

It is an arithmetic number, because the mean of its divisors is an integer number (115998773887).

Almost surely, 2^231997547773 is an apocalyptic number.

It is an amenable number.

231997547773 is a deficient number, since it is larger than the sum of its proper divisors (1).

231997547773 is an equidigital number, since it uses as much as digits as its factorization.

231997547773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70013160, while the sum is 64.

The spelling of 231997547773 in words is "two hundred thirty-one billion, nine hundred ninety-seven million, five hundred forty-seven thousand, seven hundred seventy-three".