75521 has 2 divisors, whose sum is σ = 75522. Its totient is φ = 75520.

The previous prime is 75511. The next prime is 75527. The reversal of 75521 is 12557.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67600 + 7921 = 260^2 + 89^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75521 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 75493 and 75502.

It is not a weakly prime, because it can be changed into another prime (75527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37760 + 37761.

It is an arithmetic number, because the mean of its divisors is an integer number (37761).

2⁷⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

75521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75521 is an equidigital number, since it uses as much as digits as its factorization.

75521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 350, while the sum is 20.

The square root of 75521 is about 274.8108440364. The cubic root of 75521 is about 42.2690587776.

The spelling of 75521 in words is "seventy-five thousand, five hundred twenty-one".