2106915709 has 4 divisors (see below), whose sum is σ = 2116197504. Its totient is φ = 2097633916.

The previous prime is 2106915703. The next prime is 2106915737. The reversal of 2106915709 is 9075196012.

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 2106915709 - 2¹¹ = 2106913661 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 (2106915703) 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, 4640557 + ... + 4641010.

It is an arithmetic number, because the mean of its divisors is an integer number (529049376).

Almost surely, 2^2106915709 is an apocalyptic number.

It is an amenable number.

2106915709 is a deficient number, since it is larger than the sum of its proper divisors (9281795).

2106915709 is an equidigital number, since it uses as much as digits as its factorization.

2106915709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9281794.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 2106915709 is about 45901.1514997173. The cubic root of 2106915709 is about 1281.9833568873.

The spelling of 2106915709 in words is "two billion, one hundred six million, nine hundred fifteen thousand, seven hundred nine".