123512161 has 2 divisors, whose sum is σ = 123512162. Its totient is φ = 123512160.

The previous prime is 123512143. The next prime is 123512177. The reversal of 123512161 is 161215321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120033936 + 3478225 = 10956^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 123512161 - 2⁷ = 123512033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123516161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61756080 + 61756081.

It is an arithmetic number, because the mean of its divisors is an integer number (61756081).

Almost surely, 2^123512161 is an apocalyptic number.

It is an amenable number.

123512161 is a deficient number, since it is larger than the sum of its proper divisors (1).

123512161 is an equidigital number, since it uses as much as digits as its factorization.

123512161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 22.

The square root of 123512161 is about 11113.6025212350. The cubic root of 123512161 is about 498.0082913949.

Adding to 123512161 its reverse (161215321), we get a palindrome (284727482).

The spelling of 123512161 in words is "one hundred twenty-three million, five hundred twelve thousand, one hundred sixty-one".