2129794109 has 4 divisors (see below), whose sum is σ = 2133056316. Its totient is φ = 2126531904.

The previous prime is 2129794103. The next prime is 2129794157. The reversal of 2129794109 is 9014979212.

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 915062500 + 1214731609 = 30250^2 + 34853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2129794109 is a prime.

It is a super-2 number, since 2×2129794109² = 9072045893462207762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2129794109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129794103) 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, 1630124 + ... + 1631429.

It is an arithmetic number, because the mean of its divisors is an integer number (533264079).

Almost surely, 2^2129794109 is an apocalyptic number.

It is an amenable number.

2129794109 is a deficient number, since it is larger than the sum of its proper divisors (3262207).

2129794109 is an equidigital number, since it uses as much as digits as its factorization.

2129794109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262206.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 2129794109 is about 46149.6924041754. The cubic root of 2129794109 is about 1286.6068930310.

The spelling of 2129794109 in words is "two billion, one hundred twenty-nine million, seven hundred ninety-four thousand, one hundred nine".