161644123 has 2 divisors, whose sum is σ = 161644124. Its totient is φ = 161644122.

The previous prime is 161644121. The next prime is 161644163. The reversal of 161644123 is 321446161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161644123 - 2¹ = 161644121 is a prime.

It is a super-2 number, since 2×161644123² = 52257645000878258, which contains 22 as substring.

Together with 161644121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 161644091 and 161644100.

It is not a weakly prime, because it can be changed into another prime (161644121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80822061 + 80822062.

It is an arithmetic number, because the mean of its divisors is an integer number (80822062).

Almost surely, 2^161644123 is an apocalyptic number.

161644123 is a deficient number, since it is larger than the sum of its proper divisors (1).

161644123 is an equidigital number, since it uses as much as digits as its factorization.

161644123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 161644123 is about 12713.9342062164. The cubic root of 161644123 is about 544.7367052979.

The spelling of 161644123 in words is "one hundred sixty-one million, six hundred forty-four thousand, one hundred twenty-three".