2645257 has 2 divisors, whose sum is σ = 2645258. Its totient is φ = 2645256.

The previous prime is 2645239. The next prime is 2645263. The reversal of 2645257 is 7525462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1971216 + 674041 = 1404^2 + 821^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645257 - 2⁷ = 2645129 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 6⁷ + 4⁹ + 5³ + 2¹⁷ + 5⁹ + 7⁵ .

2645257 is a lucky number.

It is equal to p₁₉₂₉₂₈ and since 2645257 and 192928 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (2645267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322628 + 1322629.

It is an arithmetic number, because the mean of its divisors is an integer number (1322629).

2^2645257 is an apocalyptic number.

It is an amenable number.

2645257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2645257 is an equidigital number, since it uses as much as digits as its factorization.

2645257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 31.

The square root of 2645257 is about 1626.4246063067. The cubic root of 2645257 is about 138.3001413889.

The spelling of 2645257 in words is "two million, six hundred forty-five thousand, two hundred fifty-seven".