201311 has 4 divisors (see below), whose sum is σ = 219624. Its totient is φ = 183000.

The previous prime is 201307. The next prime is 201329. The reversal of 201311 is 113102.

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

It is a cyclic number.

It is not a de Polignac number, because 201311 - 2² = 201307 is a prime.

It is a super-2 number, since 2×201311² = 81052237442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9140 + ... + 9161.

It is an arithmetic number, because the mean of its divisors is an integer number (54906).

2²⁰¹³¹¹ is an apocalyptic number.

201311 is a deficient number, since it is larger than the sum of its proper divisors (18313).

201311 is a wasteful number, since it uses less digits than its factorization.

201311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18312.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 201311 is about 448.6769439140. The cubic root of 201311 is about 58.6078561534.

Adding to 201311 its reverse (113102), we get a palindrome (314413).

Subtracting from 201311 its reverse (113102), we obtain a square (88209 = 297²).

It can be divided in two parts, 201 and 311, that added together give a 9-th power (512 = 2⁹).

The spelling of 201311 in words is "two hundred one thousand, three hundred eleven", and thus it is an iban number.