1249456885217 has 2 divisors, whose sum is σ = 1249456885218. Its totient is φ = 1249456885216.

The previous prime is 1249456885169. The next prime is 1249456885241. The reversal of 1249456885217 is 7125886549421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1149732929536 + 99723955681 = 1072256^2 + 315791^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249456885217 - 2¹⁴ = 1249456868833 is a prime.

It is a super-2 number, since 2×1249456885217² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1249456885217.

It is not a weakly prime, because it can be changed into another prime (1249456855217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624728442608 + 624728442609.

It is an arithmetic number, because the mean of its divisors is an integer number (624728442609).

Almost surely, 2^{1249456885217} is an apocalyptic number.

It is an amenable number.

1249456885217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249456885217 is an equidigital number, since it uses as much as digits as its factorization.

1249456885217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38707200, while the sum is 62.

The spelling of 1249456885217 in words is "one trillion, two hundred forty-nine billion, four hundred fifty-six million, eight hundred eighty-five thousand, two hundred seventeen".