71409609 has 12 divisors (see below), whose sum is σ = 103463152. Its totient is φ = 47460600.

The previous prime is 71409587. The next prime is 71409617. The reversal of 71409609 is 90690417.

71409609 is a `hidden beast` number, since 7 + 1 + 40 + 9 + 609 = 666.

It is not a de Polignac number, because 71409609 - 2²³ = 63021001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71409649) 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 11 ways as a sum of consecutive naturals, for example, 9007 + ... + 14964.

Almost surely, 2^71409609 is an apocalyptic number.

It is an amenable number.

71409609 is a deficient number, since it is larger than the sum of its proper divisors (32053543).

71409609 is a wasteful number, since it uses less digits than its factorization.

71409609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24308 (or 24305 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 71409609 is about 8450.4206404178. The cubic root of 71409609 is about 414.8765472054.

The spelling of 71409609 in words is "seventy-one million, four hundred nine thousand, six hundred nine".