75955221 has 6 divisors (see below), whose sum is σ = 109713110. Its totient is φ = 50636808.

The previous prime is 75955213. The next prime is 75955237. The reversal of 75955221 is 12255957.

It can be written as a sum of positive squares in only one way, i.e., 73102500 + 2852721 = 8550^2 + 1689^2 .

It is not a de Polignac number, because 75955221 - 2³ = 75955213 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 (75955211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4219726 + ... + 4219743.

Almost surely, 2^75955221 is an apocalyptic number.

It is an amenable number.

75955221 is a deficient number, since it is larger than the sum of its proper divisors (33757889).

75955221 is a wasteful number, since it uses less digits than its factorization.

75955221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8439475 (or 8439472 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 75955221 is about 8715.2292568813. The cubic root of 75955221 is about 423.4991508778.

It can be divided in two parts, 75955 and 221, that added together give a square (76176 = 276²).

The spelling of 75955221 in words is "seventy-five million, nine hundred fifty-five thousand, two hundred twenty-one".