75806221 has 2 divisors, whose sum is σ = 75806222. Its totient is φ = 75806220.

The previous prime is 75806149. The next prime is 75806231. The reversal of 75806221 is 12260857.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75429225 + 376996 = 8685^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 75806221 - 2¹³ = 75798029 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75806231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37903110 + 37903111.

It is an arithmetic number, because the mean of its divisors is an integer number (37903111).

Almost surely, 2^75806221 is an apocalyptic number.

It is an amenable number.

75806221 is a deficient number, since it is larger than the sum of its proper divisors (1).

75806221 is an equidigital number, since it uses as much as digits as its factorization.

75806221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 75806221 is about 8706.6768057623. The cubic root of 75806221 is about 423.2220460289. Note that the first 3 decimals are identical.

The spelling of 75806221 in words is "seventy-five million, eight hundred six thousand, two hundred twenty-one".