2129545609 has 3 divisors (see below), whose sum is σ = 2129591757. Its totient is φ = 2129499462.

The previous prime is 2129545591. The next prime is 2129545633. The reversal of 2129545609 is 9065459212.

The square root of 2129545609 is 46147.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2129545609 - 2⁵ = 2129545577 is a prime.

It is a super-2 number, since 2×2129545609² = 9069929001622361762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129545679) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 23074 + ... + 69220.

It is an arithmetic number, because the mean of its divisors is an integer number (709863919).

Almost surely, 2^2129545609 is an apocalyptic number.

2129545609 is the 46147-th square number.

2129545609 is the 23074-th centered octagonal number.

It is an amenable number.

2129545609 is a deficient number, since it is larger than the sum of its proper divisors (46148).

2129545609 is an frugal number, since it uses more digits than its factorization.

2129545609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92294 (or 46147 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The cubic root of 2129545609 is about 1286.5568515352.

The spelling of 2129545609 in words is "two billion, one hundred twenty-nine million, five hundred forty-five thousand, six hundred nine".