75605521 has 2 divisors, whose sum is σ = 75605522. Its totient is φ = 75605520.

The previous prime is 75605461. The next prime is 75605533. The reversal of 75605521 is 12550657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72437121 + 3168400 = 8511^2 + 1780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75605521 is a prime.

It is not a weakly prime, because it can be changed into another prime (75605221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37802760 + 37802761.

It is an arithmetic number, because the mean of its divisors is an integer number (37802761).

Almost surely, 2^75605521 is an apocalyptic number.

It is an amenable number.

75605521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75605521 is an equidigital number, since it uses as much as digits as its factorization.

75605521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 75605521 is about 8695.1435295802. The cubic root of 75605521 is about 422.8482168311.

The spelling of 75605521 in words is "seventy-five million, six hundred five thousand, five hundred twenty-one".