61366209 has 32 divisors (see below), whose sum is σ = 89766144. Its totient is φ = 37140480.

The previous prime is 61366189. The next prime is 61366247. The reversal of 61366209 is 90266316.

It is a happy number.

It is not a de Polignac number, because 61366209 - 2²⁰ = 60317633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61366209.

It is not an unprimeable number, because it can be changed into a prime (61366259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197164 + ... + 197474.

It is an arithmetic number, because the mean of its divisors is an integer number (2805192).

Almost surely, 2^61366209 is an apocalyptic number.

It is an amenable number.

61366209 is a deficient number, since it is larger than the sum of its proper divisors (28399935).

61366209 is a wasteful number, since it uses less digits than its factorization.

61366209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 61366209 is about 7833.6587237382. The cubic root of 61366209 is about 394.4358961639.

The spelling of 61366209 in words is "sixty-one million, three hundred sixty-six thousand, two hundred nine".