74147521 has 4 divisors (see below), whose sum is σ = 84740032. Its totient is φ = 63555012.

The previous prime is 74147503. The next prime is 74147543. The reversal of 74147521 is 12574147.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74147521 - 2¹¹ = 74145473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74147221) 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 in 3 ways as a sum of consecutive naturals, for example, 5296245 + ... + 5296258.

It is an arithmetic number, because the mean of its divisors is an integer number (21185008).

Almost surely, 2^74147521 is an apocalyptic number.

It is an amenable number.

74147521 is a deficient number, since it is larger than the sum of its proper divisors (10592511).

74147521 is a wasteful number, since it uses less digits than its factorization.

74147521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10592510.

The product of its digits is 7840, while the sum is 31.

The square root of 74147521 is about 8610.8954818880. The cubic root of 74147521 is about 420.1124434387.

The spelling of 74147521 in words is "seventy-four million, one hundred forty-seven thousand, five hundred twenty-one".