75530509 has 4 divisors (see below), whose sum is σ = 75559804. Its totient is φ = 75501216.

The previous prime is 75530503. The next prime is 75530513. The reversal of 75530509 is 90503557.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57229225 + 18301284 = 7565^2 + 4278^2 .

It is a cyclic number.

It is not a de Polignac number, because 75530509 - 2⁷ = 75530381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75530503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10362 + ... + 16075.

It is an arithmetic number, because the mean of its divisors is an integer number (18889951).

Almost surely, 2^75530509 is an apocalyptic number.

It is an amenable number.

75530509 is a deficient number, since it is larger than the sum of its proper divisors (29295).

75530509 is a wasteful number, since it uses less digits than its factorization.

75530509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29294.

The product of its (nonzero) digits is 23625, while the sum is 34.

The square root of 75530509 is about 8690.8290168430. The cubic root of 75530509 is about 422.7083276374.

The spelling of 75530509 in words is "seventy-five million, five hundred thirty thousand, five hundred nine".