1881171226369 has 2 divisors, whose sum is σ = 1881171226370. Its totient is φ = 1881171226368.

The previous prime is 1881171226357. The next prime is 1881171226373. The reversal of 1881171226369 is 9636221711881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1745001370225 + 136169856144 = 1320985^2 + 369012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1881171226369 is a prime.

It is a super-2 number, since 2×1881171226369² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1881171226469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940585613184 + 940585613185.

It is an arithmetic number, because the mean of its divisors is an integer number (940585613185).

Almost surely, 2^{1881171226369} is an apocalyptic number.

It is an amenable number.

1881171226369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881171226369 is an equidigital number, since it uses as much as digits as its factorization.

1881171226369 is an evil number, because the sum of its binary digits is even.

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

The spelling of 1881171226369 in words is "one trillion, eight hundred eighty-one billion, one hundred seventy-one million, two hundred twenty-six thousand, three hundred sixty-nine".