2081610409 has 4 divisors (see below), whose sum is σ = 2104999380. Its totient is φ = 2058221440.

The previous prime is 2081610389. The next prime is 2081610437. The reversal of 2081610409 is 9040161802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 242487184 + 1839123225 = 15572^2 + 42885^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081610409 - 2⁷ = 2081610281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2081610449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11694352 + ... + 11694529.

It is an arithmetic number, because the mean of its divisors is an integer number (526249845).

Almost surely, 2^2081610409 is an apocalyptic number.

It is an amenable number.

2081610409 is a deficient number, since it is larger than the sum of its proper divisors (23388971).

2081610409 is an equidigital number, since it uses as much as digits as its factorization.

2081610409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23388970.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 2081610409 is about 45624.6688645518. The cubic root of 2081610409 is about 1276.8302120432.

The spelling of 2081610409 in words is "two billion, eighty-one million, six hundred ten thousand, four hundred nine".