31947779859 has 16 divisors (see below), whose sum is σ = 43509726720. Its totient is φ = 20842309280.

The previous prime is 31947779837. The next prime is 31947779909. The reversal of 31947779859 is 95897774913.

It is a cyclic number.

It is not a de Polignac number, because 31947779859 - 2²⁰ = 31946731283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31947779793 and 31947779802.

It is not an unprimeable number, because it can be changed into a prime (31947779819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1345924 + ... + 1369454.

It is an arithmetic number, because the mean of its divisors is an integer number (2719357920).

Almost surely, 2^31947779859 is an apocalyptic number.

31947779859 is a deficient number, since it is larger than the sum of its proper divisors (11561946861).

31947779859 is a wasteful number, since it uses less digits than its factorization.

31947779859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33210.

The product of its digits is 120022560, while the sum is 69.

The spelling of 31947779859 in words is "thirty-one billion, nine hundred forty-seven million, seven hundred seventy-nine thousand, eight hundred fifty-nine".