1881616313 has 2 divisors, whose sum is σ = 1881616314. Its totient is φ = 1881616312.

The previous prime is 1881616291. The next prime is 1881616327. The reversal of 1881616313 is 3136161881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1263944704 + 617671609 = 35552^2 + 24853^2 .

It is an emirp because it is prime and its reverse (3136161881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881616313 - 2⁶ = 1881616249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1881616213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940808156 + 940808157.

It is an arithmetic number, because the mean of its divisors is an integer number (940808157).

Almost surely, 2^1881616313 is an apocalyptic number.

It is an amenable number.

1881616313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881616313 is an equidigital number, since it uses as much as digits as its factorization.

1881616313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 1881616313 is about 43377.6015127623. The cubic root of 1881616313 is about 1234.5547550028.

The spelling of 1881616313 in words is "one billion, eight hundred eighty-one million, six hundred sixteen thousand, three hundred thirteen".