31840061857 has 2 divisors, whose sum is σ = 31840061858. Its totient is φ = 31840061856.

The previous prime is 31840061833. The next prime is 31840061873. The reversal of 31840061857 is 75816004813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24716870656 + 7123191201 = 157216^2 + 84399^2 .

It is a cyclic number.

It is not a de Polignac number, because 31840061857 - 2²⁷ = 31705844129 is a prime.

It is not a weakly prime, because it can be changed into another prime (31840061557) 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 as a sum of consecutive naturals, namely, 15920030928 + 15920030929.

It is an arithmetic number, because the mean of its divisors is an integer number (15920030929).

Almost surely, 2^31840061857 is an apocalyptic number.

It is an amenable number.

31840061857 is a deficient number, since it is larger than the sum of its proper divisors (1).

31840061857 is an equidigital number, since it uses as much as digits as its factorization.

31840061857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 31840061857 in words is "thirty-one billion, eight hundred forty million, sixty-one thousand, eight hundred fifty-seven".