161489 has 4 divisors (see below), whose sum is σ = 162624. Its totient is φ = 160356.

The previous prime is 161471. The next prime is 161503. The reversal of 161489 is 984161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 984161 = 109 ⋅9029.

It is a cyclic number.

It is not a de Polignac number, because 161489 - 2⁸ = 161233 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161489.

It is not an unprimeable number, because it can be changed into a prime (161459) 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, 317 + ... + 650.

It is an arithmetic number, because the mean of its divisors is an integer number (40656).

2¹⁶¹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

161489 is a deficient number, since it is larger than the sum of its proper divisors (1135).

161489 is an equidigital number, since it uses as much as digits as its factorization.

161489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134.

The product of its digits is 1728, while the sum is 29.

The square root of 161489 is about 401.8569397186. The cubic root of 161489 is about 54.4562395966.

The spelling of 161489 in words is "one hundred sixty-one thousand, four hundred eighty-nine".