161308123 has 4 divisors (see below), whose sum is σ = 165667840. Its totient is φ = 156948408.

The previous prime is 161308117. The next prime is 161308127. The reversal of 161308123 is 321803161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321803161 = 2927 ⋅109943.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161308123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161308127) 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, 2179803 + ... + 2179876.

It is an arithmetic number, because the mean of its divisors is an integer number (41416960).

Almost surely, 2^161308123 is an apocalyptic number.

161308123 is a deficient number, since it is larger than the sum of its proper divisors (4359717).

161308123 is an equidigital number, since it uses as much as digits as its factorization.

161308123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4359716.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 161308123 is about 12700.7134838953. The cubic root of 161308123 is about 544.3590062408.

The spelling of 161308123 in words is "one hundred sixty-one million, three hundred eight thousand, one hundred twenty-three".