201310261 has 4 divisors (see below), whose sum is σ = 201415500. Its totient is φ = 201205024.

The previous prime is 201310217. The next prime is 201310273. The reversal of 201310261 is 162013102.

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 71487025 + 129823236 = 8455^2 + 11394^2 .

It is a cyclic number.

It is not a de Polignac number, because 201310261 - 2⁹ = 201309749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201310201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49696 + ... + 53593.

It is an arithmetic number, because the mean of its divisors is an integer number (50353875).

Almost surely, 2^201310261 is an apocalyptic number.

It is an amenable number.

201310261 is a deficient number, since it is larger than the sum of its proper divisors (105239).

201310261 is a wasteful number, since it uses less digits than its factorization.

201310261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105238.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 201310261 is about 14188.3847213134. The cubic root of 201310261 is about 586.0778443803.

Adding to 201310261 its reverse (162013102), we get a palindrome (363323363).

The spelling of 201310261 in words is "two hundred one million, three hundred ten thousand, two hundred sixty-one".