2152644281 has 4 divisors (see below), whose sum is σ = 2153515812. Its totient is φ = 2151772752.

The previous prime is 2152644271. The next prime is 2152644287. The reversal of 2152644281 is 1824462512.

2152644281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 974438656 + 1178205625 = 31216^2 + 34325^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152644281 - 2¹⁰ = 2152643257 is a prime.

It is a super-2 number, since 2×2152644281² = 9267754801044013922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2152644287) 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, 432050 + ... + 437003.

It is an arithmetic number, because the mean of its divisors is an integer number (538378953).

Almost surely, 2^2152644281 is an apocalyptic number.

It is an amenable number.

2152644281 is a deficient number, since it is larger than the sum of its proper divisors (871531).

2152644281 is an equidigital number, since it uses as much as digits as its factorization.

2152644281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871530.

The product of its digits is 30720, while the sum is 35.

The square root of 2152644281 is about 46396.5977308682. The cubic root of 2152644281 is about 1291.1917918562.

The spelling of 2152644281 in words is "two billion, one hundred fifty-two million, six hundred forty-four thousand, two hundred eighty-one".