74591221 has 2 divisors, whose sum is σ = 74591222. Its totient is φ = 74591220.

The previous prime is 74591201. The next prime is 74591267. The reversal of 74591221 is 12219547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72063121 + 2528100 = 8489^2 + 1590^2 .

It is an emirp because it is prime and its reverse (12219547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74591221 - 2¹⁵ = 74558453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74591201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37295610 + 37295611.

It is an arithmetic number, because the mean of its divisors is an integer number (37295611).

Almost surely, 2^74591221 is an apocalyptic number.

It is an amenable number.

74591221 is a deficient number, since it is larger than the sum of its proper divisors (1).

74591221 is an equidigital number, since it uses as much as digits as its factorization.

74591221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 74591221 is about 8636.6209248757. The cubic root of 74591221 is about 420.9487640832.

The spelling of 74591221 in words is "seventy-four million, five hundred ninety-one thousand, two hundred twenty-one".