74616221 has 2 divisors, whose sum is σ = 74616222. Its totient is φ = 74616220.

The previous prime is 74616203. The next prime is 74616229. The reversal of 74616221 is 12261647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43099225 + 31516996 = 6565^2 + 5614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74616221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74616229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37308110 + 37308111.

It is an arithmetic number, because the mean of its divisors is an integer number (37308111).

Almost surely, 2^74616221 is an apocalyptic number.

It is an amenable number.

74616221 is a deficient number, since it is larger than the sum of its proper divisors (1).

74616221 is an equidigital number, since it uses as much as digits as its factorization.

74616221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 74616221 is about 8638.0681289279. The cubic root of 74616221 is about 420.9957872381.

Adding to 74616221 its reverse (12261647), we get a palindrome (86877868).

The spelling of 74616221 in words is "seventy-four million, six hundred sixteen thousand, two hundred twenty-one".