231994573 has 2 divisors, whose sum is σ = 231994574. Its totient is φ = 231994572.

The previous prime is 231994571. The next prime is 231994591. The reversal of 231994573 is 375499132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211906249 + 20088324 = 14557^2 + 4482^2 .

It is a cyclic number.

It is not a de Polignac number, because 231994573 - 2¹ = 231994571 is a prime.

Together with 231994571, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231994571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115997286 + 115997287.

It is an arithmetic number, because the mean of its divisors is an integer number (115997287).

Almost surely, 2^231994573 is an apocalyptic number.

It is an amenable number.

231994573 is a deficient number, since it is larger than the sum of its proper divisors (1).

231994573 is an equidigital number, since it uses as much as digits as its factorization.

231994573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 231994573 is about 15231.3680606832. The cubic root of 231994573 is about 614.4585738747.

It can be divided in two parts, 23199 and 4573, that added together give a palindrome (27772).

The spelling of 231994573 in words is "two hundred thirty-one million, nine hundred ninety-four thousand, five hundred seventy-three".