201440161 has 8 divisors (see below), whose sum is σ = 218645504. Its totient is φ = 184479120.

The previous prime is 201440159. The next prime is 201440171. The reversal of 201440161 is 161044102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201440161 - 2¹ = 201440159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201440111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59355 + ... + 62656.

It is an arithmetic number, because the mean of its divisors is an integer number (27330688).

Almost surely, 2^201440161 is an apocalyptic number.

It is an amenable number.

201440161 is a deficient number, since it is larger than the sum of its proper divisors (17205343).

201440161 is a wasteful number, since it uses less digits than its factorization.

201440161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122151.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 201440161 is about 14192.9616711946. The cubic root of 201440161 is about 586.2038772715.

Adding to 201440161 its reverse (161044102), we get a palindrome (362484263).

It can be divided in two parts, 201440 and 161, that added together give a square (201601 = 449²).

The spelling of 201440161 in words is "two hundred one million, four hundred forty thousand, one hundred sixty-one".