2081915509 has 2 divisors, whose sum is σ = 2081915510. Its totient is φ = 2081915508.

The previous prime is 2081915467. The next prime is 2081915573. The reversal of 2081915509 is 9055191802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1114892100 + 967023409 = 33390^2 + 31097^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081915509 - 2⁹ = 2081914997 is a prime.

It is a super-2 number, since 2×2081915509² = 8668744373229458162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081915579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040957754 + 1040957755.

It is an arithmetic number, because the mean of its divisors is an integer number (1040957755).

Almost surely, 2^2081915509 is an apocalyptic number.

It is an amenable number.

2081915509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081915509 is an equidigital number, since it uses as much as digits as its factorization.

2081915509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 40.

The square root of 2081915509 is about 45628.0123279549. The cubic root of 2081915509 is about 1276.8925903290.

The spelling of 2081915509 in words is "two billion, eighty-one million, nine hundred fifteen thousand, five hundred nine".