2115667909 has 4 divisors (see below), whose sum is σ = 2116208416. Its totient is φ = 2115127404.

The previous prime is 2115667891. The next prime is 2115667919. The reversal of 2115667909 is 9097665112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2115667909 - 2⁷ = 2115667781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115667919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264339 + ... + 272224.

It is an arithmetic number, because the mean of its divisors is an integer number (529052104).

Almost surely, 2^2115667909 is an apocalyptic number.

It is an amenable number.

2115667909 is a deficient number, since it is larger than the sum of its proper divisors (540507).

2115667909 is an equidigital number, since it uses as much as digits as its factorization.

2115667909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540506.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 2115667909 is about 45996.3901735778. The cubic root of 2115667909 is about 1283.7560388087.

The spelling of 2115667909 in words is "two billion, one hundred fifteen million, six hundred sixty-seven thousand, nine hundred nine".