2081564369 has 2 divisors, whose sum is σ = 2081564370. Its totient is φ = 2081564368.

The previous prime is 2081564357. The next prime is 2081564393. The reversal of 2081564369 is 9634651802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1983811600 + 97752769 = 44540^2 + 9887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2081564369 is a prime.

It is a super-2 number, since 2×2081564369² = 8665820444580736322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2081564669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040782184 + 1040782185.

It is an arithmetic number, because the mean of its divisors is an integer number (1040782185).

Almost surely, 2^2081564369 is an apocalyptic number.

It is an amenable number.

2081564369 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081564369 is an equidigital number, since it uses as much as digits as its factorization.

2081564369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 2081564369 is about 45624.1643101548. The cubic root of 2081564369 is about 1276.8207985468.

It can be divided in two parts, 20815 and 64369, that added together give a cube (85184 = 44³).

The spelling of 2081564369 in words is "two billion, eighty-one million, five hundred sixty-four thousand, three hundred sixty-nine".