201331312011 has 6 divisors (see below), whose sum is σ = 290811895140. Its totient is φ = 134220874668.

The previous prime is 201331312003. The next prime is 201331312057. The reversal of 201331312011 is 110213133102.

201331312011 is a `hidden beast` number, since 20 + 1 + 331 + 312 + 0 + 1 + 1 = 666.

It is not a de Polignac number, because 201331312011 - 2³ = 201331312003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201331312811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11185072881 + ... + 11185072898.

It is an arithmetic number, because the mean of its divisors is an integer number (48468649190).

Almost surely, 2^201331312011 is an apocalyptic number.

201331312011 is a deficient number, since it is larger than the sum of its proper divisors (89480583129).

201331312011 is a wasteful number, since it uses less digits than its factorization.

201331312011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22370145785 (or 22370145782 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 201331312011 its reverse (110213133102), we get a palindrome (311544445113).

The spelling of 201331312011 in words is "two hundred one billion, three hundred thirty-one million, three hundred twelve thousand, eleven".