75623221 has 2 divisors, whose sum is σ = 75623222. Its totient is φ = 75623220.

The previous prime is 75623189. The next prime is 75623231. The reversal of 75623221 is 12232657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73702225 + 1920996 = 8585^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 75623221 - 2⁵ = 75623189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75623221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75623231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37811610 + 37811611.

It is an arithmetic number, because the mean of its divisors is an integer number (37811611).

Almost surely, 2^75623221 is an apocalyptic number.

It is an amenable number.

75623221 is a deficient number, since it is larger than the sum of its proper divisors (1).

75623221 is an equidigital number, since it uses as much as digits as its factorization.

75623221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 28.

The square root of 75623221 is about 8696.1612795532. The cubic root of 75623221 is about 422.8812119059.

Adding to 75623221 its reverse (12232657), we get a palindrome (87855878).

The spelling of 75623221 in words is "seventy-five million, six hundred twenty-three thousand, two hundred twenty-one".