161423539 has 2 divisors, whose sum is σ = 161423540. Its totient is φ = 161423538.

The previous prime is 161423533. The next prime is 161423543. The reversal of 161423539 is 935324161.

161423539 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 is an emirp because it is prime and its reverse (935324161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161423539 - 2¹³ = 161415347 is a prime.

It is not a weakly prime, because it can be changed into another prime (161423533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80711769 + 80711770.

It is an arithmetic number, because the mean of its divisors is an integer number (80711770).

Almost surely, 2^161423539 is an apocalyptic number.

161423539 is a deficient number, since it is larger than the sum of its proper divisors (1).

161423539 is an equidigital number, since it uses as much as digits as its factorization.

161423539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 161423539 is about 12705.2563531792. The cubic root of 161423539 is about 544.4888049544.

The spelling of 161423539 in words is "one hundred sixty-one million, four hundred twenty-three thousand, five hundred thirty-nine".