161747 has 4 divisors (see below), whose sum is σ = 170280. Its totient is φ = 153216.

The previous prime is 161743. The next prime is 161753. The reversal of 161747 is 747161.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 161747 - 2² = 161743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161741) 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, 4238 + ... + 4275.

It is an arithmetic number, because the mean of its divisors is an integer number (42570).

2¹⁶¹⁷⁴⁷ is an apocalyptic number.

161747 is a deficient number, since it is larger than the sum of its proper divisors (8533).

161747 is an equidigital number, since it uses as much as digits as its factorization.

161747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8532.

The product of its digits is 1176, while the sum is 26.

The square root of 161747 is about 402.1778213676. The cubic root of 161747 is about 54.4852245107.

The spelling of 161747 in words is "one hundred sixty-one thousand, seven hundred forty-seven".