6311561 has 4 divisors (see below), whose sum is σ = 6316800. Its totient is φ = 6306324.

The previous prime is 6311537. The next prime is 6311563. The reversal of 6311561 is 1651136.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6311561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6311563) 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, 200 + ... + 3558.

It is an arithmetic number, because the mean of its divisors is an integer number (1579200).

Almost surely, 2^6311561 is an apocalyptic number.

It is an amenable number.

6311561 is a deficient number, since it is larger than the sum of its proper divisors (5239).

6311561 is a wasteful number, since it uses less digits than its factorization.

6311561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238.

The product of its digits is 540, while the sum is 23.

The square root of 6311561 is about 2512.2820303461. The cubic root of 6311561 is about 184.8043805143.

Adding to 6311561 its reverse (1651136), we get a palindrome (7962697).

The spelling of 6311561 in words is "six million, three hundred eleven thousand, five hundred sixty-one".