231779089 has 2 divisors, whose sum is σ = 231779090. Its totient is φ = 231779088.

The previous prime is 231779087. The next prime is 231779113. The reversal of 231779089 is 980977132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159188689 + 72590400 = 12617^2 + 8520^2 .

It is a cyclic number.

It is not a de Polignac number, because 231779089 - 2¹ = 231779087 is a prime.

Together with 231779087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (231779083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115889544 + 115889545.

It is an arithmetic number, because the mean of its divisors is an integer number (115889545).

Almost surely, 2^231779089 is an apocalyptic number.

It is an amenable number.

231779089 is a deficient number, since it is larger than the sum of its proper divisors (1).

231779089 is an equidigital number, since it uses as much as digits as its factorization.

231779089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 231779089 is about 15224.2927257722. The cubic root of 231779089 is about 614.2682719995.

It can be divided in two parts, 2317 and 79089, that added together give a triangular number (81406 = T₄₀₃).

The spelling of 231779089 in words is "two hundred thirty-one million, seven hundred seventy-nine thousand, eighty-nine".