161442445 has 4 divisors (see below), whose sum is σ = 193730940. Its totient is φ = 129153952.

The previous prime is 161442439. The next prime is 161442499. The reversal of 161442445 is 544244161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544244161 = 47 ⋅11579663.

It can be written as a sum of positive squares in 2 ways, for example, as 58155876 + 103286569 = 7626^2 + 10163^2 .

It is a cyclic number.

It is not a de Polignac number, because 161442445 - 2⁷ = 161442317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16144240 + ... + 16144249.

It is an arithmetic number, because the mean of its divisors is an integer number (48432735).

Almost surely, 2^161442445 is an apocalyptic number.

It is an amenable number.

161442445 is a deficient number, since it is larger than the sum of its proper divisors (32288495).

161442445 is an equidigital number, since it uses as much as digits as its factorization.

161442445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32288494.

The product of its digits is 15360, while the sum is 31.

The square root of 161442445 is about 12706.0003541634. Note that the first 3 decimals coincide. The cubic root of 161442445 is about 544.5100610520.

The spelling of 161442445 in words is "one hundred sixty-one million, four hundred forty-two thousand, four hundred forty-five".