31718218214 has 32 divisors (see below), whose sum is σ = 53818888320. Its totient is φ = 13929556608.

The previous prime is 31718218211. The next prime is 31718218219. The reversal of 31718218214 is 41281281713.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31718218211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323132 + ... + 409695.

It is an arithmetic number, because the mean of its divisors is an integer number (1681840260).

Almost surely, 2^31718218214 is an apocalyptic number.

31718218214 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

31718218214 is a deficient number, since it is larger than the sum of its proper divisors (22100670106).

31718218214 is a wasteful number, since it uses less digits than its factorization.

31718218214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732932.

The product of its digits is 21504, while the sum is 38.

Adding to 31718218214 its reverse (41281281713), we get a palindrome (72999499927).

The spelling of 31718218214 in words is "thirty-one billion, seven hundred eighteen million, two hundred eighteen thousand, two hundred fourteen".