161145123 has 8 divisors (see below), whose sum is σ = 219857088. Its totient is φ = 104931624.

The previous prime is 161145121. The next prime is 161145143. The reversal of 161145123 is 321541161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161145123 - 2¹ = 161145121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161145093 and 161145102.

It is not an unprimeable number, because it can be changed into a prime (161145121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624465 + ... + 624722.

It is an arithmetic number, because the mean of its divisors is an integer number (27482136).

Almost surely, 2^161145123 is an apocalyptic number.

161145123 is a deficient number, since it is larger than the sum of its proper divisors (58711965).

161145123 is a wasteful number, since it uses less digits than its factorization.

161145123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249233.

The product of its digits is 720, while the sum is 24.

The square root of 161145123 is about 12694.2948996784. The cubic root of 161145123 is about 544.1755882781.

Adding to 161145123 its reverse (321541161), we get a palindrome (482686284).

The spelling of 161145123 in words is "one hundred sixty-one million, one hundred forty-five thousand, one hundred twenty-three".