161723443 has 4 divisors (see below), whose sum is σ = 184826800. Its totient is φ = 138620088.

The previous prime is 161723437. The next prime is 161723477. The reversal of 161723443 is 344327161.

161723443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344327161 = 2741 ⋅125621.

It is a cyclic number.

It is not a de Polignac number, because 161723443 - 2⁹ = 161722931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161723743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11551668 + ... + 11551681.

It is an arithmetic number, because the mean of its divisors is an integer number (46206700).

Almost surely, 2^161723443 is an apocalyptic number.

161723443 is a deficient number, since it is larger than the sum of its proper divisors (23103357).

161723443 is an equidigital number, since it uses as much as digits as its factorization.

161723443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23103356.

The product of its digits is 12096, while the sum is 31.

The square root of 161723443 is about 12717.0532357146. The cubic root of 161723443 is about 544.8257928750.

The spelling of 161723443 in words is "one hundred sixty-one million, seven hundred twenty-three thousand, four hundred forty-three".