1287355081 has 2 divisors, whose sum is σ = 1287355082. Its totient is φ = 1287355080.

The previous prime is 1287355067. The next prime is 1287355087. The reversal of 1287355081 is 1805537821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1059828025 + 227527056 = 32555^2 + 15084^2 .

It is an emirp because it is prime and its reverse (1805537821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287355081 - 2⁵ = 1287355049 is a prime.

It is a super-2 number, since 2×1287355081² = 3314566209153033122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1287355087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643677540 + 643677541.

It is an arithmetic number, because the mean of its divisors is an integer number (643677541).

Almost surely, 2^1287355081 is an apocalyptic number.

It is an amenable number.

1287355081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287355081 is an equidigital number, since it uses as much as digits as its factorization.

1287355081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 1287355081 is about 35879.7307821561. The cubic root of 1287355081 is about 1087.8427385993.

The spelling of 1287355081 in words is "one billion, two hundred eighty-seven million, three hundred fifty-five thousand, eighty-one".