31106809438 has 4 divisors (see below), whose sum is σ = 46660214160. Its totient is φ = 15553404718.

The previous prime is 31106809339. The next prime is 31106809441. The reversal of 31106809438 is 83490860113.

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

It is a junction number, because it is equal to n+sod(n) for n = 31106809394 and 31106809403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7776702358 + ... + 7776702361.

It is an arithmetic number, because the mean of its divisors is an integer number (11665053540).

Almost surely, 2^31106809438 is an apocalyptic number.

31106809438 is a deficient number, since it is larger than the sum of its proper divisors (15553404722).

31106809438 is a wasteful number, since it uses less digits than its factorization.

31106809438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15553404721.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 31106809438 in words is "thirty-one billion, one hundred six million, eight hundred nine thousand, four hundred thirty-eight".