11661613 has 2 divisors, whose sum is σ = 11661614. Its totient is φ = 11661612.

The previous prime is 11661607. The next prime is 11661619. The reversal of 11661613 is 31616611.

It is a balanced prime because it is at equal distance from previous prime (11661607) and next prime (11661619).

It can be written as a sum of positive squares in only one way, i.e., 7963684 + 3697929 = 2822^2 + 1923^2 .

It is a cyclic number.

It is not a de Polignac number, because 11661613 - 2⁹ = 11661101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11661619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5830806 + 5830807.

It is an arithmetic number, because the mean of its divisors is an integer number (5830807).

Almost surely, 2^11661613 is an apocalyptic number.

It is an amenable number.

11661613 is a deficient number, since it is larger than the sum of its proper divisors (1).

11661613 is an equidigital number, since it uses as much as digits as its factorization.

11661613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 11661613 is about 3414.9103941392. The cubic root of 11661613 is about 226.7703175988.

The spelling of 11661613 in words is "eleven million, six hundred sixty-one thousand, six hundred thirteen".