71250009 has 8 divisors (see below), whose sum is σ = 100588320. Its totient is φ = 44705856.

The previous prime is 71250007. The next prime is 71250017. The reversal of 71250009 is 90005217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71250009 - 2¹ = 71250007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71250007) 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 7 ways as a sum of consecutive naturals, for example, 698479 + ... + 698580.

It is an arithmetic number, because the mean of its divisors is an integer number (12573540).

Almost surely, 2^71250009 is an apocalyptic number.

It is an amenable number.

71250009 is a deficient number, since it is larger than the sum of its proper divisors (29338311).

71250009 is a wasteful number, since it uses less digits than its factorization.

71250009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397079.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 71250009 is about 8440.9720411810. The cubic root of 71250009 is about 414.5672345479.

It can be divided in two parts, 712 and 50009, that added together give a triangular number (50721 = T₃₁₈).

The spelling of 71250009 in words is "seventy-one million, two hundred fifty thousand, nine".