1249113878209 has 2 divisors, whose sum is σ = 1249113878210. Its totient is φ = 1249113878208.

The previous prime is 1249113878171. The next prime is 1249113878279. The reversal of 1249113878209 is 9028783119421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 918147240000 + 330966638209 = 958200^2 + 575297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249113878209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1249113878209.

It is not a weakly prime, because it can be changed into another prime (1249113878279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624556939104 + 624556939105.

It is an arithmetic number, because the mean of its divisors is an integer number (624556939105).

Almost surely, 2^{1249113878209} is an apocalyptic number.

It is an amenable number.

1249113878209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249113878209 is an equidigital number, since it uses as much as digits as its factorization.

1249113878209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 1249113878209 in words is "one trillion, two hundred forty-nine billion, one hundred thirteen million, eight hundred seventy-eight thousand, two hundred nine".