75500521 has 2 divisors, whose sum is σ = 75500522. Its totient is φ = 75500520.

The previous prime is 75500507. The next prime is 75500573. The reversal of 75500521 is 12500557.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71639296 + 3861225 = 8464^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 75500521 - 2⁵ = 75500489 is a prime.

It is a super-3 number, since 3×75500521³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (75500501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37750260 + 37750261.

It is an arithmetic number, because the mean of its divisors is an integer number (37750261).

Almost surely, 2^75500521 is an apocalyptic number.

It is an amenable number.

75500521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75500521 is an equidigital number, since it uses as much as digits as its factorization.

75500521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 75500521 is about 8689.1035786208. The cubic root of 75500521 is about 422.6523773753.

The spelling of 75500521 in words is "seventy-five million, five hundred thousand, five hundred twenty-one".