161493 has 4 divisors (see below), whose sum is σ = 215328. Its totient is φ = 107660.

The previous prime is 161471. The next prime is 161503. The reversal of 161493 is 394161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161493 - 2⁵ = 161461 is a prime.

It is an Ulam number.

It is a D-number.

161493 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26913 + ... + 26918.

It is an arithmetic number, because the mean of its divisors is an integer number (53832).

2¹⁶¹⁴⁹³ is an apocalyptic number.

It is an amenable number.

161493 is a deficient number, since it is larger than the sum of its proper divisors (53835).

161493 is an equidigital number, since it uses as much as digits as its factorization.

161493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53834.

The product of its digits is 648, while the sum is 24.

The square root of 161493 is about 401.8619165833. The cubic root of 161493 is about 54.4566892107.

The spelling of 161493 in words is "one hundred sixty-one thousand, four hundred ninety-three".