61221571 has 4 divisors (see below), whose sum is σ = 61291944. Its totient is φ = 61151200.

The previous prime is 61221529. The next prime is 61221583. The reversal of 61221571 is 17512216.

61221571 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 not a de Polignac number, because 61221571 - 2⁷ = 61221443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61221521) 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, 33865 + ... + 35626.

It is an arithmetic number, because the mean of its divisors is an integer number (15322986).

Almost surely, 2^61221571 is an apocalyptic number.

61221571 is a deficient number, since it is larger than the sum of its proper divisors (70373).

61221571 is an equidigital number, since it uses as much as digits as its factorization.

61221571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70372.

The product of its digits is 840, while the sum is 25.

The square root of 61221571 is about 7824.4214482606. The cubic root of 61221571 is about 394.1257618582.

Adding to 61221571 its reverse (17512216), we get a palindrome (78733787).

The spelling of 61221571 in words is "sixty-one million, two hundred twenty-one thousand, five hundred seventy-one".