31805238139 has 2 divisors, whose sum is σ = 31805238140. Its totient is φ = 31805238138.

The previous prime is 31805238053. The next prime is 31805238161. The reversal of 31805238139 is 93183250813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31805238139 - 2⁷ = 31805238011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31805238095 and 31805238104.

It is not a weakly prime, because it can be changed into another prime (31805239139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15902619069 + 15902619070.

It is an arithmetic number, because the mean of its divisors is an integer number (15902619070).

Almost surely, 2^31805238139 is an apocalyptic number.

31805238139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31805238139 is an equidigital number, since it uses as much as digits as its factorization.

31805238139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 31805238139 in words is "thirty-one billion, eight hundred five million, two hundred thirty-eight thousand, one hundred thirty-nine".