2152111505 has 4 divisors (see below), whose sum is σ = 2582533812. Its totient is φ = 1721689200.

The previous prime is 2152111501. The next prime is 2152111517. The reversal of 2152111505 is 5051112512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 506430016 + 1645681489 = 22504^2 + 40567^2 .

It is not a de Polignac number, because 2152111505 - 2² = 2152111501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2152111501) 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, 215211146 + ... + 215211155.

It is an arithmetic number, because the mean of its divisors is an integer number (645633453).

Almost surely, 2^2152111505 is an apocalyptic number.

It is an amenable number.

2152111505 is a deficient number, since it is larger than the sum of its proper divisors (430422307).

2152111505 is an equidigital number, since it uses as much as digits as its factorization.

2152111505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430422306.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 2152111505 is about 46390.8558338817. The cubic root of 2152111505 is about 1291.0852604358.

The spelling of 2152111505 in words is "two billion, one hundred fifty-two million, one hundred eleven thousand, five hundred five".