2109321569 has 2 divisors, whose sum is σ = 2109321570. Its totient is φ = 2109321568.

The previous prime is 2109321541. The next prime is 2109321581. The reversal of 2109321569 is 9651239012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2096540944 + 12780625 = 45788^2 + 3575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2109321569 is a prime.

It is a super-2 number, since 2×2109321569² = 8898474962897243522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2109321509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054660784 + 1054660785.

It is an arithmetic number, because the mean of its divisors is an integer number (1054660785).

Almost surely, 2^2109321569 is an apocalyptic number.

It is an amenable number.

2109321569 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109321569 is an equidigital number, since it uses as much as digits as its factorization.

2109321569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 2109321569 is about 45927.3509904501. The cubic root of 2109321569 is about 1282.4711313857.

The spelling of 2109321569 in words is "two billion, one hundred nine million, three hundred twenty-one thousand, five hundred sixty-nine".