61164221 has 2 divisors, whose sum is σ = 61164222. Its totient is φ = 61164220.

The previous prime is 61164203. The next prime is 61164227. The reversal of 61164221 is 12246116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61058596 + 105625 = 7814^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 61164221 - 2²² = 56969917 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61164227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30582110 + 30582111.

It is an arithmetic number, because the mean of its divisors is an integer number (30582111).

Almost surely, 2^61164221 is an apocalyptic number.

It is an amenable number.

61164221 is a deficient number, since it is larger than the sum of its proper divisors (1).

61164221 is an equidigital number, since it uses as much as digits as its factorization.

61164221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 61164221 is about 7820.7557818922. The cubic root of 61164221 is about 394.0026561529.

The spelling of 61164221 in words is "sixty-one million, one hundred sixty-four thousand, two hundred twenty-one".