1275847987 has 2 divisors, whose sum is σ = 1275847988. Its totient is φ = 1275847986.

The previous prime is 1275847921. The next prime is 1275848009. The reversal of 1275847987 is 7897485721.

It is a strong prime.

It is an emirp because it is prime and its reverse (7897485721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1275847987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275847387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637923993 + 637923994.

It is an arithmetic number, because the mean of its divisors is an integer number (637923994).

Almost surely, 2^1275847987 is an apocalyptic number.

1275847987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275847987 is an equidigital number, since it uses as much as digits as its factorization.

1275847987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7902720, while the sum is 58.

The square root of 1275847987 is about 35719.0143621013. The cubic root of 1275847987 is about 1084.5917856706.

The spelling of 1275847987 in words is "one billion, two hundred seventy-five million, eight hundred forty-seven thousand, nine hundred eighty-seven".