2051281 has 2 divisors, whose sum is σ = 2051282. Its totient is φ = 2051280.

The previous prime is 2051279. The next prime is 2051311. The reversal of 2051281 is 1821502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2005056 + 46225 = 1416^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051281 - 2¹ = 2051279 is a prime.

It is a super-2 number, since 2×2051281² = 8415507481922, which contains 22 as substring.

Together with 2051279, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2051251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025640 + 1025641.

It is an arithmetic number, because the mean of its divisors is an integer number (1025641).

2^2051281 is an apocalyptic number.

It is an amenable number.

2051281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051281 is an equidigital number, since it uses as much as digits as its factorization.

2051281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2051281 is about 1432.2293810699. The cubic root of 2051281 is about 127.0598638973.

Adding to 2051281 its reverse (1821502), we get a palindrome (3872783).

It can be divided in two parts, 2051 and 281, that added together give a palindrome (2332).

The spelling of 2051281 in words is "two million, fifty-one thousand, two hundred eighty-one".