1121781701813 has 2 divisors, whose sum is σ = 1121781701814. Its totient is φ = 1121781701812.

The previous prime is 1121781701791. The next prime is 1121781701839. The reversal of 1121781701813 is 3181071871211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1025646358564 + 96135343249 = 1012742^2 + 310057^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121781701813 - 2¹⁶ = 1121781636277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121781701413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560890850906 + 560890850907.

It is an arithmetic number, because the mean of its divisors is an integer number (560890850907).

Almost surely, 2^{1121781701813} is an apocalyptic number.

It is an amenable number.

1121781701813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121781701813 is an equidigital number, since it uses as much as digits as its factorization.

1121781701813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 41.

The spelling of 1121781701813 in words is "one trillion, one hundred twenty-one billion, seven hundred eighty-one million, seven hundred one thousand, eight hundred thirteen".