71299009 has 4 divisors (see below), whose sum is σ = 71711316. Its totient is φ = 70886704.

The previous prime is 71298989. The next prime is 71299043. The reversal of 71299009 is 90099217.

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 54464400 + 16834609 = 7380^2 + 4103^2 .

It is a cyclic number.

It is not a de Polignac number, because 71299009 - 2⁹ = 71298497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71299049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205894 + ... + 206239.

It is an arithmetic number, because the mean of its divisors is an integer number (17927829).

Almost surely, 2^71299009 is an apocalyptic number.

It is an amenable number.

71299009 is a deficient number, since it is larger than the sum of its proper divisors (412307).

71299009 is a wasteful number, since it uses less digits than its factorization.

71299009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412306.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 71299009 is about 8443.8740516424. The cubic root of 71299009 is about 414.6622480543.

The spelling of 71299009 in words is "seventy-one million, two hundred ninety-nine thousand, nine".