1287756097 has 2 divisors, whose sum is σ = 1287756098. Its totient is φ = 1287756096.

The previous prime is 1287756091. The next prime is 1287756143. The reversal of 1287756097 is 7906577821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1163901456 + 123854641 = 34116^2 + 11129^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287756097 - 2⁷ = 1287755969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1287756091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643878048 + 643878049.

It is an arithmetic number, because the mean of its divisors is an integer number (643878049).

Almost surely, 2^1287756097 is an apocalyptic number.

It is an amenable number.

1287756097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287756097 is an equidigital number, since it uses as much as digits as its factorization.

1287756097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1481760, while the sum is 52.

The square root of 1287756097 is about 35885.3186832721. The cubic root of 1287756097 is about 1087.9556825883.

It can be divided in two parts, 128 and 7756097, that added together give a square (7756225 = 2785²).

The spelling of 1287756097 in words is "one billion, two hundred eighty-seven million, seven hundred fifty-six thousand, ninety-seven".