74501221 has 2 divisors, whose sum is σ = 74501222. Its totient is φ = 74501220.

The previous prime is 74501183. The next prime is 74501233. The reversal of 74501221 is 12210547.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42068196 + 32433025 = 6486^2 + 5695^2 .

It is a cyclic number.

It is not a de Polignac number, because 74501221 - 2⁹ = 74500709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74501192 and 74501201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74501321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37250610 + 37250611.

It is an arithmetic number, because the mean of its divisors is an integer number (37250611).

Almost surely, 2^74501221 is an apocalyptic number.

It is an amenable number.

74501221 is a deficient number, since it is larger than the sum of its proper divisors (1).

74501221 is an equidigital number, since it uses as much as digits as its factorization.

74501221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 74501221 is about 8631.4089811571. The cubic root of 74501221 is about 420.7793936770.

Adding to 74501221 its reverse (12210547), we get a palindrome (86711768).

The spelling of 74501221 in words is "seventy-four million, five hundred one thousand, two hundred twenty-one".