161801433 has 12 divisors (see below), whose sum is σ = 234379860. Its totient is φ = 107559936.

The previous prime is 161801413. The next prime is 161801443. The reversal of 161801433 is 334108161.

161801433 is a `hidden beast` number, since 1 + 618 + 0 + 1 + 43 + 3 = 666.

161801433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 32114889 + 129686544 = 5667^2 + 11388^2 .

It is not a de Polignac number, because 161801433 - 2⁸ = 161801177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161801397 and 161801406.

It is not an unprimeable number, because it can be changed into a prime (161801413) 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, 22288 + ... + 28641.

It is an arithmetic number, because the mean of its divisors is an integer number (19531655).

Almost surely, 2^161801433 is an apocalyptic number.

It is an amenable number.

161801433 is a deficient number, since it is larger than the sum of its proper divisors (72578427).

161801433 is a wasteful number, since it uses less digits than its factorization.

161801433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51288 (or 51285 counting only the distinct ones).

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

The square root of 161801433 is about 12720.1192211394. The cubic root of 161801433 is about 544.9133582774.

Adding to 161801433 its reverse (334108161), we get a palindrome (495909594).

The spelling of 161801433 in words is "one hundred sixty-one million, eight hundred one thousand, four hundred thirty-three".