123231161 has 2 divisors, whose sum is σ = 123231162. Its totient is φ = 123231160.

The previous prime is 123231109. The next prime is 123231167. The reversal of 123231161 is 161132321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62094400 + 61136761 = 7880^2 + 7819^2 .

It is a cyclic number.

It is not a de Polignac number, because 123231161 - 2¹⁰ = 123230137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (123231167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61615580 + 61615581.

It is an arithmetic number, because the mean of its divisors is an integer number (61615581).

Almost surely, 2^123231161 is an apocalyptic number.

It is an amenable number.

123231161 is a deficient number, since it is larger than the sum of its proper divisors (1).

123231161 is an equidigital number, since it uses as much as digits as its factorization.

123231161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 123231161 is about 11100.9531572744. The cubic root of 123231161 is about 497.6303351186.

Adding to 123231161 its reverse (161132321), we get a palindrome (284363482).

The spelling of 123231161 in words is "one hundred twenty-three million, two hundred thirty-one thousand, one hundred sixty-one".