75422521 has 2 divisors, whose sum is σ = 75422522. Its totient is φ = 75422520.

The previous prime is 75422509. The next prime is 75422531. The reversal of 75422521 is 12522457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75012921 + 409600 = 8661^2 + 640^2 .

It is an emirp because it is prime and its reverse (12522457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75422521 - 2¹⁹ = 74898233 is a prime.

It is a super-3 number, since 3×75422521³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 75422521.

It is not a weakly prime, because it can be changed into another prime (75422531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37711260 + 37711261.

It is an arithmetic number, because the mean of its divisors is an integer number (37711261).

Almost surely, 2^75422521 is an apocalyptic number.

It is an amenable number.

75422521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75422521 is an equidigital number, since it uses as much as digits as its factorization.

75422521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 28.

The square root of 75422521 is about 8684.6140386318. The cubic root of 75422521 is about 422.5067790656.

Adding to 75422521 its reverse (12522457), we get a palindrome (87944978).

The spelling of 75422521 in words is "seventy-five million, four hundred twenty-two thousand, five hundred twenty-one".