161005844 has 24 divisors (see below), whose sum is σ = 299389608. Its totient is φ = 75499520.

The previous prime is 161005841. The next prime is 161005849. The reversal of 161005844 is 448500161.

It can be written as a sum of positive squares in 4 ways, for example, as 72420100 + 88585744 = 8510^2 + 9412^2 .

It is a super-3 number, since 3×161005844³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161005841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15884 + ... + 23964.

It is an arithmetic number, because the mean of its divisors is an integer number (12474567).

Almost surely, 2^161005844 is an apocalyptic number.

It is an amenable number.

161005844 is a deficient number, since it is larger than the sum of its proper divisors (138383764).

161005844 is a wasteful number, since it uses less digits than its factorization.

161005844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8395 (or 8393 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 161005844 is about 12688.8078242205. The cubic root of 161005844 is about 544.0187646714.

The spelling of 161005844 in words is "one hundred sixty-one million, five thousand, eight hundred forty-four".