161810523 has 24 divisors (see below), whose sum is σ = 267710976. Its totient is φ = 92257200.

The previous prime is 161810503. The next prime is 161810531. The reversal of 161810523 is 325018161.

161810523 is a `hidden beast` number, since 1 + 61 + 81 + 0 + 523 = 666.

It is not a de Polignac number, because 161810523 - 2¹⁰ = 161809499 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (161810503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28318 + ... + 33548.

It is an arithmetic number, because the mean of its divisors is an integer number (11154624).

Almost surely, 2^161810523 is an apocalyptic number.

161810523 is a deficient number, since it is larger than the sum of its proper divisors (105900453).

161810523 is a wasteful number, since it uses less digits than its factorization.

161810523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5735 (or 5732 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 161810523 is about 12720.4765240930. The cubic root of 161810523 is about 544.9235624921.

Adding to 161810523 its reverse (325018161), we get a palindrome (486828684).

The spelling of 161810523 in words is "one hundred sixty-one million, eight hundred ten thousand, five hundred twenty-three".