161832581 has 8 divisors (see below), whose sum is σ = 163259904. Its totient is φ = 160411680.

The previous prime is 161832563. The next prime is 161832631. The reversal of 161832581 is 185238161.

161832581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 161832581 - 2¹⁴ = 161816197 is a prime.

It is a super-2 number, since 2×161832581² = 52379568546243122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161832511) 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, 58430 + ... + 61136.

It is an arithmetic number, because the mean of its divisors is an integer number (20407488).

Almost surely, 2^161832581 is an apocalyptic number.

It is an amenable number.

161832581 is a deficient number, since it is larger than the sum of its proper divisors (1427323).

161832581 is a wasteful number, since it uses less digits than its factorization.

161832581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211.

The product of its digits is 11520, while the sum is 35.

The square root of 161832581 is about 12721.3435218140. The cubic root of 161832581 is about 544.9483226819.

The spelling of 161832581 in words is "one hundred sixty-one million, eight hundred thirty-two thousand, five hundred eighty-one".