31311122012111 has 8 divisors (see below), whose sum is σ = 31712792105280. Its totient is φ = 30909585088512.

The previous prime is 31311122012059. The next prime is 31311122012141. The reversal of 31311122012111 is 11121022111313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31311122012111 - 2¹⁰ = 31311122011087 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 (31311122012141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32819090 + ... + 33759663.

It is an arithmetic number, because the mean of its divisors is an integer number (3964099013160).

Almost surely, 2^{31311122012111} is an apocalyptic number.

31311122012111 is a deficient number, since it is larger than the sum of its proper divisors (401670093169).

31311122012111 is an equidigital number, since it uses as much as digits as its factorization.

31311122012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66584785.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 31311122012111 its reverse (11121022111313), we get a palindrome (42432144123424).

The spelling of 31311122012111 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-two million, twelve thousand, one hundred eleven".