1285187671 has 2 divisors, whose sum is σ = 1285187672. Its totient is φ = 1285187670.

The previous prime is 1285187669. The next prime is 1285187699. The reversal of 1285187671 is 1767815821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1285187671 - 2¹ = 1285187669 is a prime.

Together with 1285187669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285187611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642593835 + 642593836.

It is an arithmetic number, because the mean of its divisors is an integer number (642593836).

Almost surely, 2^1285187671 is an apocalyptic number.

1285187671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285187671 is an equidigital number, since it uses as much as digits as its factorization.

1285187671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 46.

The square root of 1285187671 is about 35849.5142365974. The cubic root of 1285187671 is about 1087.2318929687.

The spelling of 1285187671 in words is "one billion, two hundred eighty-five million, one hundred eighty-seven thousand, six hundred seventy-one".