31857828987107 has 2 divisors, whose sum is σ = 31857828987108. Its totient is φ = 31857828987106.

The previous prime is 31857828987071. The next prime is 31857828987139. The reversal of 31857828987107 is 70178982875813.

Together with previous prime (31857828987071) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31857828987107 - 2²⁸ = 31857560551651 is a prime.

It is not a weakly prime, because it can be changed into another prime (31857828287107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15928914493553 + 15928914493554.

It is an arithmetic number, because the mean of its divisors is an integer number (15928914493554).

Almost surely, 2^{31857828987107} is an apocalyptic number.

31857828987107 is a deficient number, since it is larger than the sum of its proper divisors (1).

31857828987107 is an equidigital number, since it uses as much as digits as its factorization.

31857828987107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 379330560, while the sum is 74.

The spelling of 31857828987107 in words is "thirty-one trillion, eight hundred fifty-seven billion, eight hundred twenty-eight million, nine hundred eighty-seven thousand, one hundred seven".