74240521 has 2 divisors, whose sum is σ = 74240522. Its totient is φ = 74240520.

The previous prime is 74240519. The next prime is 74240531. The reversal of 74240521 is 12504247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43560000 + 30680521 = 6600^2 + 5539^2 .

It is a cyclic number.

It is not a de Polignac number, because 74240521 - 2¹ = 74240519 is a prime.

Together with 74240519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (74240501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37120260 + 37120261.

It is an arithmetic number, because the mean of its divisors is an integer number (37120261).

Almost surely, 2^74240521 is an apocalyptic number.

It is an amenable number.

74240521 is a deficient number, since it is larger than the sum of its proper divisors (1).

74240521 is an equidigital number, since it uses as much as digits as its factorization.

74240521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 74240521 is about 8616.2939248844. The cubic root of 74240521 is about 420.2880129578.

Adding to 74240521 its reverse (12504247), we get a palindrome (86744768).

The spelling of 74240521 in words is "seventy-four million, two hundred forty thousand, five hundred twenty-one".