161677943 has 8 divisors (see below), whose sum is σ = 185335680. Its totient is φ = 138160440.

The previous prime is 161677937. The next prime is 161677949. The reversal of 161677943 is 349776161.

It is an interprime number because it is at equal distance from previous prime (161677937) and next prime (161677949).

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 161677943 - 2²⁰ = 160629367 is a prime.

It is a super-2 number, since 2×161677943² = 52279514505422498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161677894 and 161677903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161677949) 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, 32573 + ... + 37206.

It is an arithmetic number, because the mean of its divisors is an integer number (23166960).

Almost surely, 2^161677943 is an apocalyptic number.

161677943 is a deficient number, since it is larger than the sum of its proper divisors (23657737).

161677943 is an equidigital number, since it uses as much as digits as its factorization.

161677943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70117.

The product of its digits is 190512, while the sum is 44.

The square root of 161677943 is about 12715.2641734256. The cubic root of 161677943 is about 544.7746935038.

The spelling of 161677943 in words is "one hundred sixty-one million, six hundred seventy-seven thousand, nine hundred forty-three".