31947247209 has 8 divisors (see below), whose sum is σ = 42599295232. Its totient is φ = 21296682000.

The previous prime is 31947247169. The next prime is 31947247223. The reversal of 31947247209 is 90274274913.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31947247209 - 2⁸ = 31947246953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31947247309) 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 7 ways as a sum of consecutive naturals, for example, 319417 + ... + 407334.

It is an arithmetic number, because the mean of its divisors is an integer number (5324911904).

Almost surely, 2^31947247209 is an apocalyptic number.

It is an amenable number.

31947247209 is a deficient number, since it is larger than the sum of its proper divisors (10652048023).

31947247209 is a wasteful number, since it uses less digits than its factorization.

31947247209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741407.

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 31947247209 in words is "thirty-one billion, nine hundred forty-seven million, two hundred forty-seven thousand, two hundred nine".