31211123111 has 8 divisors (see below), whose sum is σ = 35997102240. Its totient is φ = 26506955808.

The previous prime is 31211123101. The next prime is 31211123143. The reversal of 31211123111 is 11132111213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31211123111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31211123111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211123101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20452136 + ... + 20453661.

It is an arithmetic number, because the mean of its divisors is an integer number (4499637780).

Almost surely, 2^31211123111 is an apocalyptic number.

31211123111 is a deficient number, since it is larger than the sum of its proper divisors (4785979129).

31211123111 is a wasteful number, since it uses less digits than its factorization.

31211123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40905913.

The product of its digits is 36, while the sum is 17.

Adding to 31211123111 its reverse (11132111213), we get a palindrome (42343234324).

The spelling of 31211123111 in words is "thirty-one billion, two hundred eleven million, one hundred twenty-three thousand, one hundred eleven".