2109576409 has 2 divisors, whose sum is σ = 2109576410. Its totient is φ = 2109576408.

The previous prime is 2109576401. The next prime is 2109576487. The reversal of 2109576409 is 9046759012.

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., 1924752384 + 184824025 = 43872^2 + 13595^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109576409 - 2³ = 2109576401 is a prime.

It is not a weakly prime, because it can be changed into another prime (2109576401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054788204 + 1054788205.

It is an arithmetic number, because the mean of its divisors is an integer number (1054788205).

Almost surely, 2^2109576409 is an apocalyptic number.

It is an amenable number.

2109576409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109576409 is an equidigital number, since it uses as much as digits as its factorization.

2109576409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 2109576409 is about 45930.1252883116. The cubic root of 2109576409 is about 1282.5227770249.

The spelling of 2109576409 in words is "two billion, one hundred nine million, five hundred seventy-six thousand, four hundred nine".