2102257 has 2 divisors, whose sum is σ = 2102258. Its totient is φ = 2102256.

The previous prime is 2102251. The next prime is 2102267. The reversal of 2102257 is 7522012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1752976 + 349281 = 1324^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102257 - 2³ = 2102249 is a prime.

It is not a weakly prime, because it can be changed into another prime (2102251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051128 + 1051129.

It is an arithmetic number, because the mean of its divisors is an integer number (1051129).

2^2102257 is an apocalyptic number.

It is an amenable number.

2102257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102257 is an equidigital number, since it uses as much as digits as its factorization.

2102257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 2102257 is about 1449.9162044753. The cubic root of 2102257 is about 128.1037773296.

Adding to 2102257 its reverse (7522012), we get a palindrome (9624269).

The spelling of 2102257 in words is "two million, one hundred two thousand, two hundred fifty-seven".