2621257 has 2 divisors, whose sum is σ = 2621258. Its totient is φ = 2621256.

The previous prime is 2621239. The next prime is 2621263. The reversal of 2621257 is 7521262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2611456 + 9801 = 1616^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621257 - 2¹¹ = 2619209 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 6 + 2²⁰ + 1 + 2²⁰ + 5⁸ + 7⁴ .

2621257 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2621207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310628 + 1310629.

It is an arithmetic number, because the mean of its divisors is an integer number (1310629).

2^2621257 is an apocalyptic number.

It is an amenable number.

2621257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621257 is an equidigital number, since it uses as much as digits as its factorization.

2621257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 25.

The square root of 2621257 is about 1619.0296476594. The cubic root of 2621257 is about 137.8806115787.

The spelling of 2621257 in words is "two million, six hundred twenty-one thousand, two hundred fifty-seven".