31947639361 has 16 divisors (see below), whose sum is σ = 35211189888. Its totient is φ = 28744192000.

The previous prime is 31947639359. The next prime is 31947639391. The reversal of 31947639361 is 16393674913.

It is a cyclic number.

It is not a de Polignac number, because 31947639361 - 2¹ = 31947639359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31947639299 and 31947639308.

It is not an unprimeable number, because it can be changed into a prime (31947639301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4021185 + ... + 4029121.

It is an arithmetic number, because the mean of its divisors is an integer number (2200699368).

Almost surely, 2^31947639361 is an apocalyptic number.

It is an amenable number.

31947639361 is a deficient number, since it is larger than the sum of its proper divisors (3263550527).

31947639361 is a wasteful number, since it uses less digits than its factorization.

31947639361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11672.

The product of its digits is 2204496, while the sum is 52.

The spelling of 31947639361 in words is "thirty-one billion, nine hundred forty-seven million, six hundred thirty-nine thousand, three hundred sixty-one".