2159281 has 2 divisors, whose sum is σ = 2159282. Its totient is φ = 2159280.

The previous prime is 2159251. The next prime is 2159291. The reversal of 2159281 is 1829512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1478656 + 680625 = 1216^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 2159281 - 2⁵ = 2159249 is a prime.

It is a super-2 number, since 2×2159281² = 9324988873922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2159231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079640 + 1079641.

It is an arithmetic number, because the mean of its divisors is an integer number (1079641).

2^2159281 is an apocalyptic number.

It is an amenable number.

2159281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159281 is an equidigital number, since it uses as much as digits as its factorization.

2159281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 2159281 is about 1469.4492165434. The cubic root of 2159281 is about 129.2517368607.

The spelling of 2159281 in words is "two million, one hundred fifty-nine thousand, two hundred eighty-one".