6521161 has 4 divisors (see below), whose sum is σ = 6864400. Its totient is φ = 6177924.

The previous prime is 6521153. The next prime is 6521197. The reversal of 6521161 is 1611256.

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 6521161 - 2³ = 6521153 is a prime.

It is a Duffinian number.

6521161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6521101) 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, 171591 + ... + 171628.

It is an arithmetic number, because the mean of its divisors is an integer number (1716100).

Almost surely, 2^6521161 is an apocalyptic number.

It is an amenable number.

6521161 is a deficient number, since it is larger than the sum of its proper divisors (343239).

6521161 is a wasteful number, since it uses less digits than its factorization.

6521161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343238.

The product of its digits is 360, while the sum is 22.

The square root of 6521161 is about 2553.6563981867. The cubic root of 6521161 is about 186.8278606917.

The spelling of 6521161 in words is "six million, five hundred twenty-one thousand, one hundred sixty-one".