61205609 has 8 divisors (see below), whose sum is σ = 63367680. Its totient is φ = 59079456.

The previous prime is 61205591. The next prime is 61205629. The reversal of 61205609 is 90650216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61205609 - 2²⁴ = 44428393 is a prime.

It is a super-2 number, since 2×61205609² = 7492253146121762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61205629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5489 + ... + 12350.

It is an arithmetic number, because the mean of its divisors is an integer number (7920960).

Almost surely, 2^61205609 is an apocalyptic number.

It is an amenable number.

61205609 is a deficient number, since it is larger than the sum of its proper divisors (2162071).

61205609 is a wasteful number, since it uses less digits than its factorization.

61205609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17959.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 61205609 is about 7823.4013702481. The cubic root of 61205609 is about 394.0915060551.

The spelling of 61205609 in words is "sixty-one million, two hundred five thousand, six hundred nine".