2564217 has 10 divisors (see below), whose sum is σ = 3830618. Its totient is φ = 1709424.

The previous prime is 2564207. The next prime is 2564249. The reversal of 2564217 is 7124652.

2564217 is a `hidden beast` number, since 2 + 5 + 642 + 17 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2178576 + 385641 = 1476^2 + 621^2 .

It is not a de Polignac number, because 2564217 - 2¹⁰ = 2563193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2564207) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15748 + ... + 15909.

2^2564217 is an apocalyptic number.

2564217 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2564217 is a deficient number, since it is larger than the sum of its proper divisors (1266401).

2564217 is an equidigital number, since it uses as much as digits as its factorization.

2564217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31669 (or 31660 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 2564217 is about 1601.3172702497. The cubic root of 2564217 is about 136.8731487834.

Adding to 2564217 its reverse (7124652), we get a palindrome (9688869).

The spelling of 2564217 in words is "two million, five hundred sixty-four thousand, two hundred seventeen".