75924221 has 2 divisors, whose sum is σ = 75924222. Its totient is φ = 75924220.

The previous prime is 75924217. The next prime is 75924229. The reversal of 75924221 is 12242957.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62884900 + 13039321 = 7930^2 + 3611^2 .

It is an emirp because it is prime and its reverse (12242957) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75924221 - 2² = 75924217 is a prime.

It is a super-3 number, since 3×75924221³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75924229) 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, 37962110 + 37962111.

It is an arithmetic number, because the mean of its divisors is an integer number (37962111).

Almost surely, 2^75924221 is an apocalyptic number.

It is an amenable number.

75924221 is a deficient number, since it is larger than the sum of its proper divisors (1).

75924221 is an equidigital number, since it uses as much as digits as its factorization.

75924221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 75924221 is about 8713.4505794203. The cubic root of 75924221 is about 423.4415280663.

The spelling of 75924221 in words is "seventy-five million, nine hundred twenty-four thousand, two hundred twenty-one".