71575221 has 4 divisors (see below), whose sum is σ = 95433632. Its totient is φ = 47716812.

The previous prime is 71575199. The next prime is 71575237. The reversal of 71575221 is 12257517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 71575221 - 2⁶ = 71575157 is a prime.

It is a super-2 number, since 2×71575221² = 10246024522397682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71575291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11929201 + ... + 11929206.

It is an arithmetic number, because the mean of its divisors is an integer number (23858408).

Almost surely, 2^71575221 is an apocalyptic number.

It is an amenable number.

71575221 is a deficient number, since it is larger than the sum of its proper divisors (23858411).

71575221 is a wasteful number, since it uses less digits than its factorization.

71575221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23858410.

The product of its digits is 4900, while the sum is 30.

The square root of 71575221 is about 8460.2140043855. The cubic root of 71575221 is about 415.1970245572.

The spelling of 71575221 in words is "seventy-one million, five hundred seventy-five thousand, two hundred twenty-one".