231122789 has 2 divisors, whose sum is σ = 231122790. Its totient is φ = 231122788.

The previous prime is 231122777. The next prime is 231122809. The reversal of 231122789 is 987221132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217120225 + 14002564 = 14735^2 + 3742^2 .

It is a cyclic number.

It is not a de Polignac number, because 231122789 - 2⁸ = 231122533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231122189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115561394 + 115561395.

It is an arithmetic number, because the mean of its divisors is an integer number (115561395).

Almost surely, 2^231122789 is an apocalyptic number.

It is an amenable number.

231122789 is a deficient number, since it is larger than the sum of its proper divisors (1).

231122789 is an equidigital number, since it uses as much as digits as its factorization.

231122789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 231122789 is about 15202.7230784488. The cubic root of 231122789 is about 613.6879415658.

The spelling of 231122789 in words is "two hundred thirty-one million, one hundred twenty-two thousand, seven hundred eighty-nine".