61608021 has 8 divisors (see below), whose sum is σ = 82288704. Its totient is φ = 40999680.

The previous prime is 61608011. The next prime is 61608047. The reversal of 61608021 is 12080616.

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

It is not a de Polignac number, because 61608021 - 2⁶ = 61607957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61607982 and 61608000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61608011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16065 + ... + 19526.

It is an arithmetic number, because the mean of its divisors is an integer number (10286088).

Almost surely, 2^61608021 is an apocalyptic number.

It is an amenable number.

61608021 is a deficient number, since it is larger than the sum of its proper divisors (20680683).

61608021 is a wasteful number, since it uses less digits than its factorization.

61608021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36171.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 61608021 is about 7849.0777165219. The cubic root of 61608021 is about 394.9533053813.

Adding to 61608021 its reverse (12080616), we get a palindrome (73688637).

The spelling of 61608021 in words is "sixty-one million, six hundred eight thousand, twenty-one".