31663093709 has 4 divisors (see below), whose sum is σ = 34098716316. Its totient is φ = 29227471104.

The previous prime is 31663093703. The next prime is 31663093711. The reversal of 31663093709 is 90739036613.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15085243684 + 16577850025 = 122822^2 + 128755^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31663093709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31663093703) 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, 1217811284 + ... + 1217811309.

It is an arithmetic number, because the mean of its divisors is an integer number (8524679079).

Almost surely, 2^31663093709 is an apocalyptic number.

It is an amenable number.

31663093709 is a deficient number, since it is larger than the sum of its proper divisors (2435622607).

31663093709 is a wasteful number, since it uses less digits than its factorization.

31663093709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435622606.

The product of its (nonzero) digits is 551124, while the sum is 47.

The spelling of 31663093709 in words is "thirty-one billion, six hundred sixty-three million, ninety-three thousand, seven hundred nine".