6115661 has 2 divisors, whose sum is σ = 6115662. Its totient is φ = 6115660.

The previous prime is 6115643. The next prime is 6115667. The reversal of 6115661 is 1665116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4972900 + 1142761 = 2230^2 + 1069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6115661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6115661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6115667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3057830 + 3057831.

It is an arithmetic number, because the mean of its divisors is an integer number (3057831).

Almost surely, 2^6115661 is an apocalyptic number.

It is an amenable number.

6115661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6115661 is an equidigital number, since it uses as much as digits as its factorization.

6115661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 6115661 is about 2472.9862514782. The cubic root of 6115661 is about 182.8722470259.

It can be divided in two parts, 6115 and 661, that added together give a palindrome (6776).

The spelling of 6115661 in words is "six million, one hundred fifteen thousand, six hundred sixty-one".