5256561 has 4 divisors (see below), whose sum is σ = 7008752. Its totient is φ = 3504372.

The previous prime is 5256547. The next prime is 5256583. The reversal of 5256561 is 1656525.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5256561 - 2⁹ = 5256049 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5256061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876091 + ... + 876096.

It is an arithmetic number, because the mean of its divisors is an integer number (1752188).

Almost surely, 2^5256561 is an apocalyptic number.

It is an amenable number.

5256561 is a deficient number, since it is larger than the sum of its proper divisors (1752191).

5256561 is a wasteful number, since it uses less digits than its factorization.

5256561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752190.

The product of its digits is 9000, while the sum is 30.

The square root of 5256561 is about 2292.7191280224. The cubic root of 5256561 is about 173.8737027745.

The spelling of 5256561 in words is "five million, two hundred fifty-six thousand, five hundred sixty-one".