123965161 has 2 divisors, whose sum is σ = 123965162. Its totient is φ = 123965160.

The previous prime is 123965143. The next prime is 123965167. The reversal of 123965161 is 161569321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123210000 + 755161 = 11100^2 + 869^2 .

It is a cyclic number.

It is not a de Polignac number, because 123965161 - 2⁹ = 123964649 is a prime.

It is a super-2 number, since 2×123965161² = 30734722283511842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123965167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61982580 + 61982581.

It is an arithmetic number, because the mean of its divisors is an integer number (61982581).

Almost surely, 2^123965161 is an apocalyptic number.

It is an amenable number.

123965161 is a deficient number, since it is larger than the sum of its proper divisors (1).

123965161 is an equidigital number, since it uses as much as digits as its factorization.

123965161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 123965161 is about 11133.9642984878. The cubic root of 123965161 is about 498.6163894420.

The spelling of 123965161 in words is "one hundred twenty-three million, nine hundred sixty-five thousand, one hundred sixty-one".