1287694252253 has 2 divisors, whose sum is σ = 1287694252254. Its totient is φ = 1287694252252.

The previous prime is 1287694252249. The next prime is 1287694252289. The reversal of 1287694252253 is 3522524967821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279029807364 + 8664444889 = 1130942^2 + 93083^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287694252253 - 2² = 1287694252249 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287694272253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643847126126 + 643847126127.

It is an arithmetic number, because the mean of its divisors is an integer number (643847126127).

Almost surely, 2^{1287694252253} is an apocalyptic number.

It is an amenable number.

1287694252253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287694252253 is an equidigital number, since it uses as much as digits as its factorization.

1287694252253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14515200, while the sum is 56.

The spelling of 1287694252253 in words is "one trillion, two hundred eighty-seven billion, six hundred ninety-four million, two hundred fifty-two thousand, two hundred fifty-three".