31106811 has 4 divisors (see below), whose sum is σ = 41475752. Its totient is φ = 20737872.

The previous prime is 31106791. The next prime is 31106837. The reversal of 31106811 is 11860113.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31106811 - 2⁷ = 31106683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31106711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5184466 + ... + 5184471.

It is an arithmetic number, because the mean of its divisors is an integer number (10368938).

Almost surely, 2^31106811 is an apocalyptic number.

31106811 is a deficient number, since it is larger than the sum of its proper divisors (10368941).

31106811 is a wasteful number, since it uses less digits than its factorization.

31106811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10368940.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 31106811 is about 5577.3480257198. The cubic root of 31106811 is about 314.4984409189.

Adding to 31106811 its reverse (11860113), we get a palindrome (42966924).

The spelling of 31106811 in words is "thirty-one million, one hundred six thousand, eight hundred eleven".