161523 has 12 divisors (see below), whose sum is σ = 236808. Its totient is φ = 106080.

The previous prime is 161521. The next prime is 161527. The reversal of 161523 is 325161.

It is not a de Polignac number, because 161523 - 2¹ = 161521 is a prime.

161523 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 161496 and 161505.

It is not an unprimeable number, because it can be changed into a prime (161521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1111 + ... + 1247.

It is an arithmetic number, because the mean of its divisors is an integer number (19734).

2¹⁶¹⁵²³ is an apocalyptic number.

161523 is a deficient number, since it is larger than the sum of its proper divisors (75285).

161523 is a wasteful number, since it uses less digits than its factorization.

161523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 271 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 161523 is about 401.8992411040. The cubic root of 161523 is about 54.4600610793.

Adding to 161523 its reverse (325161), we get a palindrome (486684).

The spelling of 161523 in words is "one hundred sixty-one thousand, five hundred twenty-three".