2199144781081 has 2 divisors, whose sum is σ = 2199144781082. Its totient is φ = 2199144781080.

The previous prime is 2199144781079. The next prime is 2199144781117. The reversal of 2199144781081 is 1801874419912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1240539302025 + 958605479056 = 1113795^2 + 979084^2 .

It is a cyclic number.

It is not a de Polignac number, because 2199144781081 - 2¹ = 2199144781079 is a prime.

It is a super-2 number, since 2×2199144781081² (a number of 25 digits) contains 22 as substring.

Together with 2199144781079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2199144781061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099572390540 + 1099572390541.

It is an arithmetic number, because the mean of its divisors is an integer number (1099572390541).

Almost surely, 2^{2199144781081} is an apocalyptic number.

It is an amenable number.

2199144781081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2199144781081 is an equidigital number, since it uses as much as digits as its factorization.

2199144781081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 55.

The spelling of 2199144781081 in words is "two trillion, one hundred ninety-nine billion, one hundred forty-four million, seven hundred eighty-one thousand, eighty-one".