5257561 has 4 divisors (see below), whose sum is σ = 5369472. Its totient is φ = 5145652.

The previous prime is 5257559. The next prime is 5257583. The reversal of 5257561 is 1657525.

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 a cyclic number.

It is not a de Polignac number, because 5257561 - 2¹ = 5257559 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

5257561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5257531) 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, 55885 + ... + 55978.

It is an arithmetic number, because the mean of its divisors is an integer number (1342368).

Almost surely, 2^5257561 is an apocalyptic number.

It is an amenable number.

5257561 is a deficient number, since it is larger than the sum of its proper divisors (111911).

5257561 is a wasteful number, since it uses less digits than its factorization.

5257561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111910.

The product of its digits is 10500, while the sum is 31.

The square root of 5257561 is about 2292.9371993145. The cubic root of 5257561 is about 173.8847278964.

The spelling of 5257561 in words is "five million, two hundred fifty-seven thousand, five hundred sixty-one".