6511161 has 4 divisors (see below), whose sum is σ = 8681552. Its totient is φ = 4340772.

The previous prime is 6511159. The next prime is 6511171. The reversal of 6511161 is 1611156.

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 6511161 - 2¹ = 6511159 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6511111) 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, 1085191 + ... + 1085196.

It is an arithmetic number, because the mean of its divisors is an integer number (2170388).

Almost surely, 2^6511161 is an apocalyptic number.

It is an amenable number.

6511161 is a deficient number, since it is larger than the sum of its proper divisors (2170391).

6511161 is a wasteful number, since it uses less digits than its factorization.

6511161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170390.

The product of its digits is 180, while the sum is 21.

The square root of 6511161 is about 2551.6976701796. The cubic root of 6511161 is about 186.7323135744.

The spelling of 6511161 in words is "six million, five hundred eleven thousand, one hundred sixty-one".