31321031011 has 4 divisors (see below), whose sum is σ = 32682814992. Its totient is φ = 29959247032.

The previous prime is 31321031003. The next prime is 31321031029. The reversal of 31321031011 is 11013012313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11013012313 = 19 ⋅579632227.

It is a cyclic number.

It is not a de Polignac number, because 31321031011 - 2³ = 31321031003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31321031111) 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, 680891956 + ... + 680892001.

It is an arithmetic number, because the mean of its divisors is an integer number (8170703748).

Almost surely, 2^31321031011 is an apocalyptic number.

31321031011 is a deficient number, since it is larger than the sum of its proper divisors (1361783981).

31321031011 is a wasteful number, since it uses less digits than its factorization.

31321031011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361783980.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 31321031011 its reverse (11013012313), we get a palindrome (42334043324).

The spelling of 31321031011 in words is "thirty-one billion, three hundred twenty-one million, thirty-one thousand, eleven".