74513309 has 4 divisors (see below), whose sum is σ = 80245116. Its totient is φ = 68781504.

The previous prime is 74513303. The next prime is 74513311. The reversal of 74513309 is 90331547.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17556100 + 56957209 = 4190^2 + 7547^2 .

It is a cyclic number.

It is not a de Polignac number, because 74513309 - 2¹⁶ = 74447773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74513303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2865884 + ... + 2865909.

It is an arithmetic number, because the mean of its divisors is an integer number (20061279).

Almost surely, 2^74513309 is an apocalyptic number.

It is an amenable number.

74513309 is a deficient number, since it is larger than the sum of its proper divisors (5731807).

74513309 is a wasteful number, since it uses less digits than its factorization.

74513309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731806.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 74513309 is about 8632.1091860564. The cubic root of 74513309 is about 420.8021499315.

The spelling of 74513309 in words is "seventy-four million, five hundred thirteen thousand, three hundred nine".