201961217 has 4 divisors (see below), whose sum is σ = 205771860. Its totient is φ = 198150576.

The previous prime is 201961213. The next prime is 201961273. The reversal of 201961217 is 712169102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142301041 + 59660176 = 11929^2 + 7724^2 .

It is a cyclic number.

It is not a de Polignac number, because 201961217 - 2² = 201961213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201961217.

It is not an unprimeable number, because it can be changed into a prime (201961213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1905242 + ... + 1905347.

It is an arithmetic number, because the mean of its divisors is an integer number (51442965).

Almost surely, 2^201961217 is an apocalyptic number.

It is an amenable number.

201961217 is a deficient number, since it is larger than the sum of its proper divisors (3810643).

201961217 is an equidigital number, since it uses as much as digits as its factorization.

201961217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3810642.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 201961217 is about 14211.3059568781. The cubic root of 201961217 is about 586.7088776375.

It can be divided in two parts, 2019 and 61217, that added together give a palindrome (63236).

The spelling of 201961217 in words is "two hundred one million, nine hundred sixty-one thousand, two hundred seventeen".