161393 has 4 divisors (see below), whose sum is σ = 162288. Its totient is φ = 160500.

The previous prime is 161387. The next prime is 161407. The reversal of 161393 is 393161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161393 - 2⁴ = 161377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161303) 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, 71 + ... + 572.

It is an arithmetic number, because the mean of its divisors is an integer number (40572).

2¹⁶¹³⁹³ is an apocalyptic number.

It is an amenable number.

161393 is a deficient number, since it is larger than the sum of its proper divisors (895).

161393 is an equidigital number, since it uses as much as digits as its factorization.

161393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894.

The product of its digits is 486, while the sum is 23.

The square root of 161393 is about 401.7374764694. The cubic root of 161393 is about 54.4454466319.

The spelling of 161393 in words is "one hundred sixty-one thousand, three hundred ninety-three".