71218387 has 6 divisors (see below), whose sum is σ = 72351524. Its totient is φ = 70087380.

The previous prime is 71218339. The next prime is 71218417. The reversal of 71218387 is 78381217.

It is a de Polignac number, because none of the positive numbers 2^k-71218387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71218307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68562 + ... + 69592.

Almost surely, 2^71218387 is an apocalyptic number.

71218387 is a deficient number, since it is larger than the sum of its proper divisors (1133137).

71218387 is an frugal number, since it uses more digits than its factorization.

71218387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129 (or 1098 counting only the distinct ones).

The product of its digits is 18816, while the sum is 37.

The square root of 71218387 is about 8439.0987078005. The cubic root of 71218387 is about 414.5058947430.

The spelling of 71218387 in words is "seventy-one million, two hundred eighteen thousand, three hundred eighty-seven".