31430671218 has 96 divisors (see below), whose sum is σ = 71264793600. Its totient is φ = 10381998096.

The previous prime is 31430671199. The next prime is 31430671271. The reversal of 31430671218 is 81217603413.

It is a happy number.

31430671218 is a `hidden beast` number, since 3 + 1 + 430 + 6 + 7 + 1 + 218 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38189955 + ... + 38190777.

It is an arithmetic number, because the mean of its divisors is an integer number (742341600).

Almost surely, 2^31430671218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31430671218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35632396800).

31430671218 is an abundant number, since it is smaller than the sum of its proper divisors (39834122382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31430671218 is a wasteful number, since it uses less digits than its factorization.

31430671218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458 (or 1446 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 31430671218 in words is "thirty-one billion, four hundred thirty million, six hundred seventy-one thousand, two hundred eighteen".