6502561 has 4 divisors (see below), whose sum is σ = 7002772. Its totient is φ = 6002352.

The previous prime is 6502553. The next prime is 6502571. The reversal of 6502561 is 1652056.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1299600 + 5202961 = 1140^2 + 2281^2 .

It is a cyclic number.

It is not a de Polignac number, because 6502561 - 2³ = 6502553 is a prime.

It is a Duffinian number.

6502561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6502501) 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, 250086 + ... + 250111.

It is an arithmetic number, because the mean of its divisors is an integer number (1750693).

Almost surely, 2^6502561 is an apocalyptic number.

It is an amenable number.

6502561 is a deficient number, since it is larger than the sum of its proper divisors (500211).

6502561 is a wasteful number, since it uses less digits than its factorization.

6502561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500210.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 6502561 is about 2550.0119607563. The cubic root of 6502561 is about 186.6500647792.

The spelling of 6502561 in words is "six million, five hundred two thousand, five hundred sixty-one".