31947261239 has 4 divisors (see below), whose sum is σ = 32086769160. Its totient is φ = 31807753320.

The previous prime is 31947261191. The next prime is 31947261253. The reversal of 31947261239 is 93216274913.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31947261239 - 2¹² = 31947257143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31947261193 and 31947261202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31947269239) 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, 69753617 + ... + 69754074.

It is an arithmetic number, because the mean of its divisors is an integer number (8021692290).

Almost surely, 2^31947261239 is an apocalyptic number.

31947261239 is a deficient number, since it is larger than the sum of its proper divisors (139507921).

31947261239 is a wasteful number, since it uses less digits than its factorization.

31947261239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139507920.

The product of its digits is 489888, while the sum is 47.

The spelling of 31947261239 in words is "thirty-one billion, nine hundred forty-seven million, two hundred sixty-one thousand, two hundred thirty-nine".