6311661 has 4 divisors (see below), whose sum is σ = 8415552. Its totient is φ = 4207772.

The previous prime is 6311659. The next prime is 6311689. The reversal of 6311661 is 1661136.

6311661 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 6311661 - 2¹ = 6311659 is a prime.

It is a D-number.

6311661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6311161) 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, 1051941 + ... + 1051946.

It is an arithmetic number, because the mean of its divisors is an integer number (2103888).

Almost surely, 2^6311661 is an apocalyptic number.

It is an amenable number.

6311661 is a deficient number, since it is larger than the sum of its proper divisors (2103891).

6311661 is a wasteful number, since it uses less digits than its factorization.

6311661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103890.

The product of its digits is 648, while the sum is 24.

The square root of 6311661 is about 2512.3019324914. The cubic root of 6311661 is about 184.8053565191.

Adding to 6311661 its reverse (1661136), we get a palindrome (7972797).

The spelling of 6311661 in words is "six million, three hundred eleven thousand, six hundred sixty-one".