201211312031 has 4 divisors (see below), whose sum is σ = 203285655552. Its totient is φ = 199136968512.

The previous prime is 201211312021. The next prime is 201211312033. The reversal of 201211312031 is 130213112102.

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 201211312031 - 2¹⁴ = 201211295647 is a prime.

It is a super-2 number, since 2×201211312031² (a number of 23 digits) 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 (201211312033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037171615 + ... + 1037171808.

It is an arithmetic number, because the mean of its divisors is an integer number (50821413888).

Almost surely, 2^201211312031 is an apocalyptic number.

201211312031 is a deficient number, since it is larger than the sum of its proper divisors (2074343521).

201211312031 is an equidigital number, since it uses as much as digits as its factorization.

201211312031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074343520.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 201211312031 its reverse (130213112102), we get a palindrome (331424424133).

The spelling of 201211312031 in words is "two hundred one billion, two hundred eleven million, three hundred twelve thousand, thirty-one".