2818561 has 2 divisors, whose sum is σ = 2818562. Its totient is φ = 2818560.

The previous prime is 2818553. The next prime is 2818577. The reversal of 2818561 is 1658182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 553536 = 1505^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 2818561 - 2³ = 2818553 is a prime.

It is a super-2 number, since 2×2818561² = 15888572221442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2818531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1409280 + 1409281.

It is an arithmetic number, because the mean of its divisors is an integer number (1409281).

2^2818561 is an apocalyptic number.

It is an amenable number.

2818561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2818561 is an equidigital number, since it uses as much as digits as its factorization.

2818561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 31.

The square root of 2818561 is about 1678.8570516872. The cubic root of 2818561 is about 141.2567292589.

The spelling of 2818561 in words is "two million, eight hundred eighteen thousand, five hundred sixty-one".