75156221 has 8 divisors (see below), whose sum is σ = 86744064. Its totient is φ = 63781200.

The previous prime is 75156163. The next prime is 75156223. The reversal of 75156221 is 12265157.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 75156221 - 2¹⁴ = 75139837 is a prime.

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 (75156223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52445 + ... + 53858.

It is an arithmetic number, because the mean of its divisors is an integer number (10843008).

Almost surely, 2^75156221 is an apocalyptic number.

It is an amenable number.

75156221 is a deficient number, since it is larger than the sum of its proper divisors (11587843).

75156221 is a wasteful number, since it uses less digits than its factorization.

75156221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106411.

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

The square root of 75156221 is about 8669.2687696253. The cubic root of 75156221 is about 422.0089337971.

The spelling of 75156221 in words is "seventy-five million, one hundred fifty-six thousand, two hundred twenty-one".