61232221 has 2 divisors, whose sum is σ = 61232222. Its totient is φ = 61232220.

The previous prime is 61232209. The next prime is 61232243. The reversal of 61232221 is 12223216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 25100100 = 6011^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 61232221 - 2¹¹ = 61230173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61232251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30616110 + 30616111.

It is an arithmetic number, because the mean of its divisors is an integer number (30616111).

Almost surely, 2^61232221 is an apocalyptic number.

It is an amenable number.

61232221 is a deficient number, since it is larger than the sum of its proper divisors (1).

61232221 is an equidigital number, since it uses as much as digits as its factorization.

61232221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 61232221 is about 7825.1019801661. The cubic root of 61232221 is about 394.1486143480.

Adding to 61232221 its reverse (12223216), we get a palindrome (73455437).

The spelling of 61232221 in words is "sixty-one million, two hundred thirty-two thousand, two hundred twenty-one".