161860401 has 6 divisors (see below), whose sum is σ = 233798370. Its totient is φ = 107906928.

The previous prime is 161860367. The next prime is 161860403. The reversal of 161860401 is 104068161.

161860401 is a `hidden beast` number, since 1 + 618 + 6 + 0 + 40 + 1 = 666.

161860401 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 only one way, i.e., 161798400 + 62001 = 12720^2 + 249^2 .

It is not a de Polignac number, because 161860401 - 2⁶ = 161860337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161860403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8992236 + ... + 8992253.

It is an arithmetic number, because the mean of its divisors is an integer number (38966395).

Almost surely, 2^161860401 is an apocalyptic number.

It is an amenable number.

161860401 is a deficient number, since it is larger than the sum of its proper divisors (71937969).

161860401 is a wasteful number, since it uses less digits than its factorization.

161860401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17984495 (or 17984492 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 161860401 is about 12722.4369127931. The cubic root of 161860401 is about 544.9795475309.

It can be divided in two parts, 161860 and 401, that added together give a palindrome (162261).

The spelling of 161860401 in words is "one hundred sixty-one million, eight hundred sixty thousand, four hundred one".