2152281 has 4 divisors (see below), whose sum is σ = 2869712. Its totient is φ = 1434852.

The previous prime is 2152247. The next prime is 2152291. The reversal of 2152281 is 1822512.

It is a happy number.

2152281 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2152281 - 2⁷ = 2152153 is a prime.

It is a super-2 number, since 2×2152281² = 9264627005922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2152201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358711 + ... + 358716.

It is an arithmetic number, because the mean of its divisors is an integer number (717428).

2^2152281 is an apocalyptic number.

It is an amenable number.

2152281 is a deficient number, since it is larger than the sum of its proper divisors (717431).

2152281 is an equidigital number, since it uses as much as digits as its factorization.

2152281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717430.

The product of its digits is 320, while the sum is 21.

The square root of 2152281 is about 1467.0654382133. The cubic root of 2152281 is about 129.1119153777. Note that the first 3 decimals are identical.

Adding to 2152281 its reverse (1822512), we get a palindrome (3974793).

It can be divided in two parts, 21 and 52281, that multiplied together give a palindrome (1097901).

The spelling of 2152281 in words is "two million, one hundred fifty-two thousand, two hundred eighty-one".