61016221 has 12 divisors (see below), whose sum is σ = 71686620. Its totient is φ = 51777600.

The previous prime is 61016191. The next prime is 61016227. The reversal of 61016221 is 12261016.

It can be written as a sum of positive squares in 2 ways, for example, as 25613721 + 35402500 = 5061^2 + 5950^2 .

It is not a de Polignac number, because 61016221 - 2⁷ = 61016093 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 (61016227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1216 + ... + 11113.

It is an arithmetic number, because the mean of its divisors is an integer number (5973885).

Almost surely, 2^61016221 is an apocalyptic number.

It is an amenable number.

61016221 is a deficient number, since it is larger than the sum of its proper divisors (10670399).

61016221 is a wasteful number, since it uses less digits than its factorization.

61016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12444 (or 12437 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 61016221 is about 7811.2880499953. The cubic root of 61016221 is about 393.6846080707.

Adding to 61016221 its reverse (12261016), we get a palindrome (73277237).

The spelling of 61016221 in words is "sixty-one million, sixteen thousand, two hundred twenty-one".