161242723 has 2 divisors, whose sum is σ = 161242724. Its totient is φ = 161242722.

The previous prime is 161242681. The next prime is 161242729. The reversal of 161242723 is 327242161.

It is a strong prime.

It is an emirp because it is prime and its reverse (327242161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161242723 - 2²⁵ = 127688291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161242691 and 161242700.

It is not a weakly prime, because it can be changed into another prime (161242729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80621361 + 80621362.

It is an arithmetic number, because the mean of its divisors is an integer number (80621362).

Almost surely, 2^161242723 is an apocalyptic number.

161242723 is a deficient number, since it is larger than the sum of its proper divisors (1).

161242723 is an equidigital number, since it uses as much as digits as its factorization.

161242723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 161242723 is about 12698.1385643723. The cubic root of 161242723 is about 544.2854288521.

Adding to 161242723 its reverse (327242161), we get a palindrome (488484884).

The spelling of 161242723 in words is "one hundred sixty-one million, two hundred forty-two thousand, seven hundred twenty-three".