31857828987071 has 2 divisors, whose sum is σ = 31857828987072. Its totient is φ = 31857828987070.

The previous prime is 31857828987059. The next prime is 31857828987107. The reversal of 31857828987071 is 17078982875813.

Together with next prime (31857828987107) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31857828987071 - 2¹⁰ = 31857828986047 is a prime.

It is a super-2 number, since 2×31857828987071² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31857828987071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31857828987001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15928914493535 + 15928914493536.

It is an arithmetic number, because the mean of its divisors is an integer number (15928914493536).

Almost surely, 2^{31857828987071} is an apocalyptic number.

31857828987071 is a deficient number, since it is larger than the sum of its proper divisors (1).

31857828987071 is an equidigital number, since it uses as much as digits as its factorization.

31857828987071 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 31857828987071 in words is "thirty-one trillion, eight hundred fifty-seven billion, eight hundred twenty-eight million, nine hundred eighty-seven thousand, seventy-one".