31100020111 has 4 divisors (see below), whose sum is σ = 31111222032. Its totient is φ = 31088818192.

The previous prime is 31100020103. The next prime is 31100020153. The reversal of 31100020111 is 11102000113.

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 31100020111 - 2³ = 31100020103 is a prime.

It is a super-2 number, since 2×31100020111² (a number of 22 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 (31100020411) 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, 5596795 + ... + 5602348.

It is an arithmetic number, because the mean of its divisors is an integer number (7777805508).

Almost surely, 2^31100020111 is an apocalyptic number.

31100020111 is a deficient number, since it is larger than the sum of its proper divisors (11201921).

31100020111 is a wasteful number, since it uses less digits than its factorization.

31100020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11201920.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 31100020111 its reverse (11102000113), we get a palindrome (42202020224).

The spelling of 31100020111 in words is "thirty-one billion, one hundred million, twenty thousand, one hundred eleven".