2129579047 has 4 divisors (see below), whose sum is σ = 2137267336. Its totient is φ = 2121890760.

The previous prime is 2129579029. The next prime is 2129579051. The reversal of 2129579047 is 7409759212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2129579047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2129578988 and 2129579006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129579017) 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, 3843729 + ... + 3844282.

It is an arithmetic number, because the mean of its divisors is an integer number (534316834).

Almost surely, 2^2129579047 is an apocalyptic number.

2129579047 is a deficient number, since it is larger than the sum of its proper divisors (7688289).

2129579047 is an equidigital number, since it uses as much as digits as its factorization.

2129579047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7688288.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 2129579047 is about 46147.3622973188. The cubic root of 2129579047 is about 1286.5635853133.

The spelling of 2129579047 in words is "two billion, one hundred twenty-nine million, five hundred seventy-nine thousand, forty-seven".