161940201 has 16 divisors (see below), whose sum is σ = 221574528. Its totient is φ = 105142400.

The previous prime is 161940199. The next prime is 161940209. The reversal of 161940201 is 102049161.

It is a cyclic number.

It is not a de Polignac number, because 161940201 - 2¹ = 161940199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161940209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126175 + ... + 127451.

It is an arithmetic number, because the mean of its divisors is an integer number (13848408).

Almost surely, 2^161940201 is an apocalyptic number.

It is an amenable number.

161940201 is a deficient number, since it is larger than the sum of its proper divisors (59634327).

161940201 is a wasteful number, since it uses less digits than its factorization.

161940201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 161940201 is about 12725.5727179565. The cubic root of 161940201 is about 545.0690942896.

Adding to 161940201 its reverse (102049161), we get a palindrome (263989362).

Subtracting from 161940201 its reverse (102049161), we obtain a triangular number (59891040 = T₁₀₉₄₄).

The spelling of 161940201 in words is "one hundred sixty-one million, nine hundred forty thousand, two hundred one".