75165221 has 4 divisors (see below), whose sum is σ = 75211212. Its totient is φ = 75119232.

The previous prime is 75165169. The next prime is 75165229. The reversal of 75165221 is 12256157.

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 69472225 + 5692996 = 8335^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 75165221 - 2⁶ = 75165157 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 (75165229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20450 + ... + 23843.

It is an arithmetic number, because the mean of its divisors is an integer number (18802803).

Almost surely, 2^75165221 is an apocalyptic number.

It is an amenable number.

75165221 is a deficient number, since it is larger than the sum of its proper divisors (45991).

75165221 is a wasteful number, since it uses less digits than its factorization.

75165221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45990.

The product of its digits is 4200, while the sum is 29.

The square root of 75165221 is about 8669.7878290071. The cubic root of 75165221 is about 422.0257783943.

The spelling of 75165221 in words is "seventy-five million, one hundred sixty-five thousand, two hundred twenty-one".