61406221 has 2 divisors, whose sum is σ = 61406222. Its totient is φ = 61406220.

The previous prime is 61406209. The next prime is 61406243. The reversal of 61406221 is 12260416.

It is an a-pointer prime, because the next prime (61406243) can be obtained adding 61406221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52490025 + 8916196 = 7245^2 + 2986^2 .

It is a cyclic number.

It is not a de Polignac number, because 61406221 - 2⁹ = 61405709 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61406192 and 61406201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61406281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30703110 + 30703111.

It is an arithmetic number, because the mean of its divisors is an integer number (30703111).

Almost surely, 2^61406221 is an apocalyptic number.

It is an amenable number.

61406221 is a deficient number, since it is larger than the sum of its proper divisors (1).

61406221 is an equidigital number, since it uses as much as digits as its factorization.

61406221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 61406221 is about 7836.2121589452. The cubic root of 61406221 is about 394.5216042460.

Adding to 61406221 its reverse (12260416), we get a palindrome (73666637).

The spelling of 61406221 in words is "sixty-one million, four hundred six thousand, two hundred twenty-one".