5256661 has 2 divisors, whose sum is σ = 5256662. Its totient is φ = 5256660.

The previous prime is 5256653. The next prime is 5256679. The reversal of 5256661 is 1666525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2869636 + 2387025 = 1694^2 + 1545^2 .

It is a cyclic number.

It is not a de Polignac number, because 5256661 - 2³ = 5256653 is a prime.

It is a Chen prime.

5256661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5256061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628330 + 2628331.

It is an arithmetic number, because the mean of its divisors is an integer number (2628331).

Almost surely, 2^5256661 is an apocalyptic number.

It is an amenable number.

5256661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5256661 is an equidigital number, since it uses as much as digits as its factorization.

5256661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 5256661 is about 2292.7409360850. The cubic root of 5256661 is about 173.8748053496.

The spelling of 5256661 in words is "five million, two hundred fifty-six thousand, six hundred sixty-one".