31939390939 has 2 divisors, whose sum is σ = 31939390940. Its totient is φ = 31939390938.

The previous prime is 31939390891. The next prime is 31939390969. The reversal of 31939390939 is 93909393913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31939390939 - 2¹³ = 31939382747 is a prime.

It is not a weakly prime, because it can be changed into another prime (31939390969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15969695469 + 15969695470.

It is an arithmetic number, because the mean of its divisors is an integer number (15969695470).

Almost surely, 2^31939390939 is an apocalyptic number.

31939390939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31939390939 is an equidigital number, since it uses as much as digits as its factorization.

31939390939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4782969, while the sum is 58.

The spelling of 31939390939 in words is "thirty-one billion, nine hundred thirty-nine million, three hundred ninety thousand, nine hundred thirty-nine".