161810433 has 16 divisors (see below), whose sum is σ = 240014400. Its totient is φ = 107740800.

The previous prime is 161810417. The next prime is 161810443. The reversal of 161810433 is 334018161.

161810433 is a `hidden beast` number, since 1 + 618 + 1 + 0 + 43 + 3 = 666.

It is not a de Polignac number, because 161810433 - 2⁴ = 161810417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 161810397 and 161810406.

It is not an unprimeable number, because it can be changed into a prime (161810443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21858 + ... + 28308.

It is an arithmetic number, because the mean of its divisors is an integer number (15000900).

Almost surely, 2^161810433 is an apocalyptic number.

It is an amenable number.

161810433 is a deficient number, since it is larger than the sum of its proper divisors (78203967).

161810433 is an equidigital number, since it uses as much as digits as its factorization.

161810433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7389 (or 7383 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 161810433 is about 12720.4729864891. The cubic root of 161810433 is about 544.9234614621.

Adding to 161810433 its reverse (334018161), we get a palindrome (495828594).

The spelling of 161810433 in words is "one hundred sixty-one million, eight hundred ten thousand, four hundred thirty-three".