74609521 has 4 divisors (see below), whose sum is σ = 85268032. Its totient is φ = 63951012.

The previous prime is 74609473. The next prime is 74609543. The reversal of 74609521 is 12590647.

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 74609521 - 2⁹ = 74609009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74609581) 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, 5329245 + ... + 5329258.

It is an arithmetic number, because the mean of its divisors is an integer number (21317008).

Almost surely, 2^74609521 is an apocalyptic number.

It is an amenable number.

74609521 is a deficient number, since it is larger than the sum of its proper divisors (10658511).

74609521 is a wasteful number, since it uses less digits than its factorization.

74609521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10658510.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 74609521 is about 8637.6803020255. The cubic root of 74609521 is about 420.9831860629.

The spelling of 74609521 in words is "seventy-four million, six hundred nine thousand, five hundred twenty-one".