2152528181 has 4 divisors (see below), whose sum is σ = 2162010912. Its totient is φ = 2143045452.

The previous prime is 2152528129. The next prime is 2152528187. The reversal of 2152528181 is 1818252512.

It is a happy number.

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 not a de Polignac number, because 2152528181 - 2¹⁸ = 2152266037 is a prime.

It is a super-2 number, since 2×2152528181² = 9266755139998337522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2152528187) 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, 4741025 + ... + 4741478.

It is an arithmetic number, because the mean of its divisors is an integer number (540502728).

Almost surely, 2^2152528181 is an apocalyptic number.

It is an amenable number.

2152528181 is a deficient number, since it is larger than the sum of its proper divisors (9482731).

2152528181 is an equidigital number, since it uses as much as digits as its factorization.

2152528181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482730.

The product of its digits is 12800, while the sum is 35.

The square root of 2152528181 is about 46395.3465446698. The cubic root of 2152528181 is about 1291.1685785361.

The spelling of 2152528181 in words is "two billion, one hundred fifty-two million, five hundred twenty-eight thousand, one hundred eighty-one".