71919009 has 48 divisors (see below), whose sum is σ = 116742080. Its totient is φ = 44089920.

The previous prime is 71919007. The next prime is 71919037. The reversal of 71919009 is 90091917.

It is not a de Polignac number, because 71919009 - 2¹ = 71919007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71919007) 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 47 ways as a sum of consecutive naturals, for example, 170619 + ... + 171039.

Almost surely, 2^71919009 is an apocalyptic number.

It is an amenable number.

71919009 is a deficient number, since it is larger than the sum of its proper divisors (44823071).

71919009 is a wasteful number, since it uses less digits than its factorization.

71919009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 71919009 is about 8480.5075909405. The cubic root of 71919009 is about 415.8607171317.

The spelling of 71919009 in words is "seventy-one million, nine hundred nineteen thousand, nine".