31331214 has 12 divisors (see below), whose sum is σ = 67884336. Its totient is φ = 10443732.

The previous prime is 31331207. The next prime is 31331231. The reversal of 31331214 is 41213313.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1740623 = 31331214 / (3 + 1 + 3 + 3 + 1 + 2 + 1 + 4).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 870294 + ... + 870329.

It is an arithmetic number, because the mean of its divisors is an integer number (5657028).

It is a self-describing number.

Almost surely, 2^31331214 is an apocalyptic number.

31331214 is an abundant number, since it is smaller than the sum of its proper divisors (36553122).

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

31331214 is a wasteful number, since it uses less digits than its factorization.

31331214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740631 (or 1740628 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 31331214 is about 5597.4292313526. The cubic root of 31331214 is about 315.2528883806.

Adding to 31331214 its reverse (41213313), we get a palindrome (72544527).

The spelling of 31331214 in words is "thirty-one million, three hundred thirty-one thousand, two hundred fourteen".