31709906609 has 4 divisors (see below), whose sum is σ = 31710282240. Its totient is φ = 31709530980.

The previous prime is 31709906507. The next prime is 31709906647. The reversal of 31709906609 is 90660990713.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31709906609 - 2²⁰ = 31708858033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31709906699) 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, 4352 + ... + 251870.

It is an arithmetic number, because the mean of its divisors is an integer number (7927570560).

Almost surely, 2^31709906609 is an apocalyptic number.

It is an amenable number.

31709906609 is a deficient number, since it is larger than the sum of its proper divisors (375631).

31709906609 is a wasteful number, since it uses less digits than its factorization.

31709906609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375630.

The product of its (nonzero) digits is 551124, while the sum is 50.

The spelling of 31709906609 in words is "thirty-one billion, seven hundred nine million, nine hundred six thousand, six hundred nine".