31909381606 has 16 divisors (see below), whose sum is σ = 49247806608. Its totient is φ = 15497546400.

The previous prime is 31909381597. The next prime is 31909381663. The reversal of 31909381606 is 60618390913.

It is a super-2 number, since 2×31909381606² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009405 + ... + 1040536.

It is an arithmetic number, because the mean of its divisors is an integer number (3077987913).

Almost surely, 2^31909381606 is an apocalyptic number.

31909381606 is a deficient number, since it is larger than the sum of its proper divisors (17338425002).

31909381606 is a wasteful number, since it uses less digits than its factorization.

31909381606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050167.

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 31909381606 in words is "thirty-one billion, nine hundred nine million, three hundred eighty-one thousand, six hundred six".