71917989 has 16 divisors (see below), whose sum is σ = 112655424. Its totient is φ = 40233600.

The previous prime is 71917981. The next prime is 71918009. The reversal of 71917989 is 98971917.

It is not a de Polignac number, because 71917989 - 2³ = 71917981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71917981) 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 15 ways as a sum of consecutive naturals, for example, 83392 + ... + 84249.

It is an arithmetic number, because the mean of its divisors is an integer number (7040964).

Almost surely, 2^71917989 is an apocalyptic number.

It is an amenable number.

71917989 is a deficient number, since it is larger than the sum of its proper divisors (40737435).

71917989 is a wasteful number, since it uses less digits than its factorization.

71917989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167668.

The product of its digits is 285768, while the sum is 51.

The square root of 71917989 is about 8480.4474528176. The cubic root of 71917989 is about 415.8587511242.

The spelling of 71917989 in words is "seventy-one million, nine hundred seventeen thousand, nine hundred eighty-nine".