231606161 has 2 divisors, whose sum is σ = 231606162. Its totient is φ = 231606160.

The previous prime is 231606149. The next prime is 231606163. The reversal of 231606161 is 161606132.

231606161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223681936 + 7924225 = 14956^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 231606161 - 2¹⁰ = 231605137 is a prime.

Together with 231606163, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231606161.

It is not a weakly prime, because it can be changed into another prime (231606163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115803080 + 115803081.

It is an arithmetic number, because the mean of its divisors is an integer number (115803081).

Almost surely, 2^231606161 is an apocalyptic number.

It is an amenable number.

231606161 is a deficient number, since it is larger than the sum of its proper divisors (1).

231606161 is an equidigital number, since it uses as much as digits as its factorization.

231606161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 231606161 is about 15218.6123217592. The cubic root of 231606161 is about 614.1154675731.

The spelling of 231606161 in words is "two hundred thirty-one million, six hundred six thousand, one hundred sixty-one".