74822221 has 2 divisors, whose sum is σ = 74822222. Its totient is φ = 74822220.

The previous prime is 74822213. The next prime is 74822227. The reversal of 74822221 is 12222847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47416996 + 27405225 = 6886^2 + 5235^2 .

It is a cyclic number.

It is not a de Polignac number, because 74822221 - 2³ = 74822213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74822221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74822227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37411110 + 37411111.

It is an arithmetic number, because the mean of its divisors is an integer number (37411111).

Almost surely, 2^74822221 is an apocalyptic number.

It is an amenable number.

74822221 is a deficient number, since it is larger than the sum of its proper divisors (1).

74822221 is an equidigital number, since it uses as much as digits as its factorization.

74822221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 28.

The square root of 74822221 is about 8649.9838728173. The cubic root of 74822221 is about 421.3828587672.

The spelling of 74822221 in words is "seventy-four million, eight hundred twenty-two thousand, two hundred twenty-one".