11656109 has 2 divisors, whose sum is σ = 11656110. Its totient is φ = 11656108.

The previous prime is 11656103. The next prime is 11656111. The reversal of 11656109 is 90165611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11356900 + 299209 = 3370^2 + 547^2 .

It is a cyclic number.

It is not a de Polignac number, because 11656109 - 2¹² = 11652013 is a prime.

Together with 11656111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11656103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5828054 + 5828055.

It is an arithmetic number, because the mean of its divisors is an integer number (5828055).

Almost surely, 2^11656109 is an apocalyptic number.

It is an amenable number.

11656109 is a deficient number, since it is larger than the sum of its proper divisors (1).

11656109 is an equidigital number, since it uses as much as digits as its factorization.

11656109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 11656109 is about 3414.1044213673. The cubic root of 11656109 is about 226.7346352781.

It can be divided in two parts, 1165610 and 9, that multiplied together give a triangular number (10490490 = T₄₅₈₀).

The spelling of 11656109 in words is "eleven million, six hundred fifty-six thousand, one hundred nine".