75525521 has 2 divisors, whose sum is σ = 75525522. Its totient is φ = 75525520.

The previous prime is 75525481. The next prime is 75525523. The reversal of 75525521 is 12552557.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 9834496 = 8105^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 75525521 - 2²⁶ = 8416657 is a prime.

Together with 75525523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75525523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37762760 + 37762761.

It is an arithmetic number, because the mean of its divisors is an integer number (37762761).

Almost surely, 2^75525521 is an apocalyptic number.

It is an amenable number.

75525521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75525521 is an equidigital number, since it uses as much as digits as its factorization.

75525521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17500, while the sum is 32.

The square root of 75525521 is about 8690.5420429338. The cubic root of 75525521 is about 422.6990222781.

The spelling of 75525521 in words is "seventy-five million, five hundred twenty-five thousand, five hundred twenty-one".