74191009 has 4 divisors (see below), whose sum is σ = 78555204. Its totient is φ = 69826816.

The previous prime is 74191001. The next prime is 74191021. The reversal of 74191009 is 90019147.

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 69555600 + 4635409 = 8340^2 + 2153^2 .

It is a cyclic number.

It is not a de Polignac number, because 74191009 - 2³ = 74191001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74191001) 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, 2182072 + ... + 2182105.

It is an arithmetic number, because the mean of its divisors is an integer number (19638801).

Almost surely, 2^74191009 is an apocalyptic number.

It is an amenable number.

74191009 is a deficient number, since it is larger than the sum of its proper divisors (4364195).

74191009 is a wasteful number, since it uses less digits than its factorization.

74191009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4364194.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 74191009 is about 8613.4202846488. The cubic root of 74191009 is about 420.1945602739.

The spelling of 74191009 in words is "seventy-four million, one hundred ninety-one thousand, nine".