61220171 has 4 divisors (see below), whose sum is σ = 61287000. Its totient is φ = 61153344.

The previous prime is 61220153. The next prime is 61220183. The reversal of 61220171 is 17102216.

61220171 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61220171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61220191) 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, 32021 + ... + 33878.

It is an arithmetic number, because the mean of its divisors is an integer number (15321750).

Almost surely, 2^61220171 is an apocalyptic number.

61220171 is a deficient number, since it is larger than the sum of its proper divisors (66829).

61220171 is an equidigital number, since it uses as much as digits as its factorization.

61220171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66828.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 61220171 is about 7824.3319842655. The cubic root of 61220171 is about 394.1227575779.

Adding to 61220171 its reverse (17102216), we get a palindrome (78322387).

The spelling of 61220171 in words is "sixty-one million, two hundred twenty thousand, one hundred seventy-one".