75491221 has 16 divisors (see below), whose sum is σ = 86244480. Its totient is φ = 65545920.

The previous prime is 75491219. The next prime is 75491233. The reversal of 75491221 is 12219457.

It is a cyclic number.

It is not a de Polignac number, because 75491221 - 2¹ = 75491219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75491201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16170 + ... + 20308.

It is an arithmetic number, because the mean of its divisors is an integer number (5390280).

Almost surely, 2^75491221 is an apocalyptic number.

It is an amenable number.

75491221 is a deficient number, since it is larger than the sum of its proper divisors (10753259).

75491221 is a wasteful number, since it uses less digits than its factorization.

75491221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236.

The product of its digits is 5040, while the sum is 31.

The square root of 75491221 is about 8688.5684091224. The cubic root of 75491221 is about 422.6350228438.

The spelling of 75491221 in words is "seventy-five million, four hundred ninety-one thousand, two hundred twenty-one".