123161939 has 2 divisors, whose sum is σ = 123161940. Its totient is φ = 123161938.

The previous prime is 123161921. The next prime is 123161963. The reversal of 123161939 is 939161321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123161939 - 2¹⁶ = 123096403 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123161899 and 123161908.

It is not a weakly prime, because it can be changed into another prime (123161239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61580969 + 61580970.

It is an arithmetic number, because the mean of its divisors is an integer number (61580970).

Almost surely, 2^123161939 is an apocalyptic number.

123161939 is a deficient number, since it is larger than the sum of its proper divisors (1).

123161939 is an equidigital number, since it uses as much as digits as its factorization.

123161939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 35.

The square root of 123161939 is about 11097.8348789302. The cubic root of 123161939 is about 497.5371405654.

The spelling of 123161939 in words is "one hundred twenty-three million, one hundred sixty-one thousand, nine hundred thirty-nine".