61993009 has 4 divisors (see below), whose sum is σ = 66761716. Its totient is φ = 57224304.

The previous prime is 61993003. The next prime is 61993021. The reversal of 61993009 is 90039916.

61993009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40602384 + 21390625 = 6372^2 + 4625^2 .

It is a cyclic number.

It is not a de Polignac number, because 61993009 - 2¹¹ = 61990961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61993003) 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 in 3 ways as a sum of consecutive naturals, for example, 2384334 + ... + 2384359.

It is an arithmetic number, because the mean of its divisors is an integer number (16690429).

Almost surely, 2^61993009 is an apocalyptic number.

It is an amenable number.

61993009 is a deficient number, since it is larger than the sum of its proper divisors (4768707).

61993009 is a wasteful number, since it uses less digits than its factorization.

61993009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4768706.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 61993009 is about 7873.5639325530. The cubic root of 61993009 is about 395.7742842690.

The spelling of 61993009 in words is "sixty-one million, nine hundred ninety-three thousand, nine".