161732681 has 8 divisors (see below), whose sum is σ = 182520000. Its totient is φ = 141959440.

The previous prime is 161732663. The next prime is 161732689. The reversal of 161732681 is 186237161.

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 161732681 - 2¹⁰ = 161731657 is a prime.

It is a super-2 number, since 2×161732681² = 52314920206895522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161732689) 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, 253181 + ... + 253818.

It is an arithmetic number, because the mean of its divisors is an integer number (22815000).

Almost surely, 2^161732681 is an apocalyptic number.

161732681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161732681 is a deficient number, since it is larger than the sum of its proper divisors (20787319).

161732681 is a wasteful number, since it uses less digits than its factorization.

161732681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507039.

The product of its digits is 12096, while the sum is 35.

The square root of 161732681 is about 12717.4164436021. The cubic root of 161732681 is about 544.8361665614.

The spelling of 161732681 in words is "one hundred sixty-one million, seven hundred thirty-two thousand, six hundred eighty-one".