74192521 has 6 divisors (see below), whose sum is σ = 80338830. Its totient is φ = 68485248.

The previous prime is 74192519. The next prime is 74192533. The reversal of 74192521 is 12529147.

It can be written as a sum of positive squares in 3 ways, for example, as 10368400 + 63824121 = 3220^2 + 7989^2 .

It is not a de Polignac number, because 74192521 - 2¹ = 74192519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74190521) 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 in 5 ways as a sum of consecutive naturals, for example, 219336 + ... + 219673.

It is an arithmetic number, because the mean of its divisors is an integer number (13389805).

Almost surely, 2^74192521 is an apocalyptic number.

It is an amenable number.

74192521 is a deficient number, since it is larger than the sum of its proper divisors (6146309).

74192521 is a wasteful number, since it uses less digits than its factorization.

74192521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439035 (or 439022 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 74192521 is about 8613.5080542135. The cubic root of 74192521 is about 420.1974147522.

The spelling of 74192521 in words is "seventy-four million, one hundred ninety-two thousand, five hundred twenty-one".