61206221 has 2 divisors, whose sum is σ = 61206222. Its totient is φ = 61206220.

The previous prime is 61206217. The next prime is 61206259. The reversal of 61206221 is 12260216.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 23629321 = 6130^2 + 4861^2 .

It is a cyclic number.

It is not a de Polignac number, because 61206221 - 2² = 61206217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61206193 and 61206202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61206281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30603110 + 30603111.

It is an arithmetic number, because the mean of its divisors is an integer number (30603111).

Almost surely, 2^61206221 is an apocalyptic number.

It is an amenable number.

61206221 is a deficient number, since it is larger than the sum of its proper divisors (1).

61206221 is an equidigital number, since it uses as much as digits as its factorization.

61206221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 61206221 is about 7823.4404835724. The cubic root of 61206221 is about 394.0928195687.

Adding to 61206221 its reverse (12260216), we get a palindrome (73466437).

The spelling of 61206221 in words is "sixty-one million, two hundred six thousand, two hundred twenty-one".