2181376313 has 2 divisors, whose sum is σ = 2181376314. Its totient is φ = 2181376312.

The previous prime is 2181376303. The next prime is 2181376331. The reversal of 2181376313 is 3136731812.

Together with next prime (2181376331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2071797289 + 109579024 = 45517^2 + 10468^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181376313 - 2²⁴ = 2164599097 is a prime.

It is not a weakly prime, because it can be changed into another prime (2181376303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090688156 + 1090688157.

It is an arithmetic number, because the mean of its divisors is an integer number (1090688157).

Almost surely, 2^2181376313 is an apocalyptic number.

It is an amenable number.

2181376313 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181376313 is an equidigital number, since it uses as much as digits as its factorization.

2181376313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 2181376313 is about 46705.2064870717. The cubic root of 2181376313 is about 1296.9110711430.

The spelling of 2181376313 in words is "two billion, one hundred eighty-one million, three hundred seventy-six thousand, three hundred thirteen".