31504681939 has 2 divisors, whose sum is σ = 31504681940. Its totient is φ = 31504681938.

The previous prime is 31504681937. The next prime is 31504681951. The reversal of 31504681939 is 93918640513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31504681939 - 2¹ = 31504681937 is a prime.

Together with 31504681937, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31504681892 and 31504681901.

It is not a weakly prime, because it can be changed into another prime (31504681931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15752340969 + 15752340970.

It is an arithmetic number, because the mean of its divisors is an integer number (15752340970).

Almost surely, 2^31504681939 is an apocalyptic number.

31504681939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31504681939 is an equidigital number, since it uses as much as digits as its factorization.

31504681939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 31504681939 in words is "thirty-one billion, five hundred four million, six hundred eighty-one thousand, nine hundred thirty-nine".