71281218031 has 8 divisors (see below), whose sum is σ = 71359504128. Its totient is φ = 71202975000.

The previous prime is 71281218023. The next prime is 71281218089. The reversal of 71281218031 is 13081218217.

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

It is a cyclic number.

It is not a de Polignac number, because 71281218031 - 2³ = 71281218023 is a prime.

It is a super-2 number, since 2×71281218031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71281918031) 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 7 ways as a sum of consecutive naturals, for example, 4128186 + ... + 4145416.

It is an arithmetic number, because the mean of its divisors is an integer number (8919938016).

Almost surely, 2^71281218031 is an apocalyptic number.

71281218031 is a deficient number, since it is larger than the sum of its proper divisors (78286097).

71281218031 is a wasteful number, since it uses less digits than its factorization.

71281218031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21533.

The product of its (nonzero) digits is 5376, while the sum is 34.

The spelling of 71281218031 in words is "seventy-one billion, two hundred eighty-one million, two hundred eighteen thousand, thirty-one".