2129654689 has 4 divisors (see below), whose sum is σ = 2129946624. Its totient is φ = 2129362756.

The previous prime is 2129654669. The next prime is 2129654693. The reversal of 2129654689 is 9864569212.

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 a de Polignac number, because none of the positive numbers 2^k-2129654689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129654609) 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, 134737 + ... + 149710.

It is an arithmetic number, because the mean of its divisors is an integer number (532486656).

Almost surely, 2^2129654689 is an apocalyptic number.

It is an amenable number.

2129654689 is a deficient number, since it is larger than the sum of its proper divisors (291935).

2129654689 is an equidigital number, since it uses as much as digits as its factorization.

2129654689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291934.

The product of its digits is 1866240, while the sum is 52.

The square root of 2129654689 is about 46148.1818601773. The cubic root of 2129654689 is about 1286.5788179154.

The spelling of 2129654689 in words is "two billion, one hundred twenty-nine million, six hundred fifty-four thousand, six hundred eighty-nine".