2115724009 has 9 divisors (see below), whose sum is σ = 2461522941. Its totient is φ = 1813201740.

The previous prime is 2115724007. The next prime is 2115724031. The reversal of 2115724009 is 9004275112.

The square root of 2115724009 is 45997.

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

It is not a de Polignac number, because 2115724009 - 2¹ = 2115724007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115724007) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 318694 + ... + 325264.

It is an arithmetic number, because the mean of its divisors is an integer number (273502549).

Almost surely, 2^2115724009 is an apocalyptic number.

2115724009 is the 45997-th square number.

2115724009 is the 22999-th centered octagonal number.

It is an amenable number.

2115724009 is a deficient number, since it is larger than the sum of its proper divisors (345798932).

2115724009 is an frugal number, since it uses more digits than its factorization.

2115724009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13156 (or 6578 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The cubic root of 2115724009 is about 1283.7673855923.

The spelling of 2115724009 in words is "two billion, one hundred fifteen million, seven hundred twenty-four thousand, nine".