161189684 has 12 divisors (see below), whose sum is σ = 282883524. Its totient is φ = 80365824.

The previous prime is 161189683. The next prime is 161189689. The reversal of 161189684 is 486981161.

It can be written as a sum of positive squares in 2 ways, for example, as 111091600 + 50098084 = 10540^2 + 7078^2 .

It is a super-2 number, since 2×161189684² = 51964228456039712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161189683) 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, 55667 + ... + 58490.

It is an arithmetic number, because the mean of its divisors is an integer number (23573627).

Almost surely, 2^161189684 is an apocalyptic number.

It is an amenable number.

161189684 is a deficient number, since it is larger than the sum of its proper divisors (121693840).

161189684 is a wasteful number, since it uses less digits than its factorization.

161189684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114514 (or 114512 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 161189684 is about 12696.0499368898. The cubic root of 161189684 is about 544.2257434283.

The spelling of 161189684 in words is "one hundred sixty-one million, one hundred eighty-nine thousand, six hundred eighty-four".