74124521 has 2 divisors, whose sum is σ = 74124522. Its totient is φ = 74124520.

The previous prime is 74124509. The next prime is 74124553. The reversal of 74124521 is 12542147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72914521 + 1210000 = 8539^2 + 1100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74124521 is a prime.

It is a super-2 number, since 2×74124521² = 10988889226958882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (74124221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37062260 + 37062261.

It is an arithmetic number, because the mean of its divisors is an integer number (37062261).

Almost surely, 2^74124521 is an apocalyptic number.

It is an amenable number.

74124521 is a deficient number, since it is larger than the sum of its proper divisors (1).

74124521 is an equidigital number, since it uses as much as digits as its factorization.

74124521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 26.

The square root of 74124521 is about 8609.5598609917. The cubic root of 74124521 is about 420.0690003793.

Adding to 74124521 its reverse (12542147), we get a palindrome (86666668).

The spelling of 74124521 in words is "seventy-four million, one hundred twenty-four thousand, five hundred twenty-one".