1285252687 has 2 divisors, whose sum is σ = 1285252688. Its totient is φ = 1285252686.

The previous prime is 1285252613. The next prime is 1285252697. The reversal of 1285252687 is 7862525821.

It is a strong prime.

It is an emirp because it is prime and its reverse (7862525821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285252687 - 2¹¹ = 1285250639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285252607) 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, 642626343 + 642626344.

It is an arithmetic number, because the mean of its divisors is an integer number (642626344).

Almost surely, 2^1285252687 is an apocalyptic number.

1285252687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285252687 is an equidigital number, since it uses as much as digits as its factorization.

1285252687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 537600, while the sum is 46.

The square root of 1285252687 is about 35850.4210156589. The cubic root of 1285252687 is about 1087.2502265497.

The spelling of 1285252687 in words is "one billion, two hundred eighty-five million, two hundred fifty-two thousand, six hundred eighty-seven".