61650221 has 8 divisors (see below), whose sum is σ = 63080640. Its totient is φ = 60232768.

The previous prime is 61650217. The next prime is 61650233. The reversal of 61650221 is 12205616.

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 61650221 - 2² = 61650217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61650241) 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, 6725 + ... + 12981.

It is an arithmetic number, because the mean of its divisors is an integer number (7885080).

Almost surely, 2^61650221 is an apocalyptic number.

It is an amenable number.

61650221 is a deficient number, since it is larger than the sum of its proper divisors (1430419).

61650221 is a wasteful number, since it uses less digits than its factorization.

61650221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6483.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 61650221 is about 7851.7654702621. The cubic root of 61650221 is about 395.0434626106.

Adding to 61650221 its reverse (12205616), we get a palindrome (73855837).

The spelling of 61650221 in words is "sixty-one million, six hundred fifty thousand, two hundred twenty-one".