2129275729 has 32 divisors (see below), whose sum is σ = 2567600640. Its totient is φ = 1727308800.

The previous prime is 2129275697. The next prime is 2129275747. The reversal of 2129275729 is 9275729212.

It is a happy number.

It is not a de Polignac number, because 2129275729 - 2⁵ = 2129275697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129275429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3473227 + ... + 3473839.

It is an arithmetic number, because the mean of its divisors is an integer number (80237520).

Almost surely, 2^2129275729 is an apocalyptic number.

2129275729 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2129275729 is a deficient number, since it is larger than the sum of its proper divisors (438324911).

2129275729 is a wasteful number, since it uses less digits than its factorization.

2129275729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961.

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

The square root of 2129275729 is about 46144.0757736028. The cubic root of 2129275729 is about 1286.5025002485.

The spelling of 2129275729 in words is "two billion, one hundred twenty-nine million, two hundred seventy-five thousand, seven hundred twenty-nine".