1261872800939 has 2 divisors, whose sum is σ = 1261872800940. Its totient is φ = 1261872800938.

The previous prime is 1261872800911. The next prime is 1261872801023. The reversal of 1261872800939 is 9390082781621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261872800939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261872806939) 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, 630936400469 + 630936400470.

It is an arithmetic number, because the mean of its divisors is an integer number (630936400470).

Almost surely, 2^{1261872800939} is an apocalyptic number.

1261872800939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261872800939 is an equidigital number, since it uses as much as digits as its factorization.

1261872800939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The spelling of 1261872800939 in words is "one trillion, two hundred sixty-one billion, eight hundred seventy-two million, eight hundred thousand, nine hundred thirty-nine".