31106734721 has 4 divisors (see below), whose sum is σ = 32459201472. Its totient is φ = 29754267972.

The previous prime is 31106734679. The next prime is 31106734777. The reversal of 31106734721 is 12743760113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31106734721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31106734781) 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, 676233341 + ... + 676233386.

It is an arithmetic number, because the mean of its divisors is an integer number (8114800368).

Almost surely, 2^31106734721 is an apocalyptic number.

It is an amenable number.

31106734721 is a deficient number, since it is larger than the sum of its proper divisors (1352466751).

31106734721 is a wasteful number, since it uses less digits than its factorization.

31106734721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352466750.

The product of its (nonzero) digits is 21168, while the sum is 35.

The spelling of 31106734721 in words is "thirty-one billion, one hundred six million, seven hundred thirty-four thousand, seven hundred twenty-one".