61113209 has 2 divisors, whose sum is σ = 61113210. Its totient is φ = 61113208.

The previous prime is 61113161. The next prime is 61113211. The reversal of 61113209 is 90231116.

It is a happy number.

61113209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53290000 + 7823209 = 7300^2 + 2797^2 .

It is a cyclic number.

It is not a de Polignac number, because 61113209 - 2²⁰ = 60064633 is a prime.

Together with 61113211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61113259) 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, 30556604 + 30556605.

It is an arithmetic number, because the mean of its divisors is an integer number (30556605).

Almost surely, 2^61113209 is an apocalyptic number.

It is an amenable number.

61113209 is a deficient number, since it is larger than the sum of its proper divisors (1).

61113209 is an equidigital number, since it uses as much as digits as its factorization.

61113209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 61113209 is about 7817.4937799783. The cubic root of 61113209 is about 393.8930907166.

The spelling of 61113209 in words is "sixty-one million, one hundred thirteen thousand, two hundred nine".