31212016 has 40 divisors (see below), whose sum is σ = 67767984. Its totient is φ = 13800960.

The previous prime is 31212001. The next prime is 31212037. The reversal of 31212016 is 61021213.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4116 + ... + 8908.

Almost surely, 2^31212016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31212016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33883992).

31212016 is an abundant number, since it is smaller than the sum of its proper divisors (36555968).

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

31212016 is a wasteful number, since it uses less digits than its factorization.

31212016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4849 (or 4843 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 31212016 is about 5586.7715185069. The cubic root of 31212016 is about 314.8525924895.

Adding to 31212016 its reverse (61021213), we get a palindrome (92233229).

The spelling of 31212016 in words is "thirty-one million, two hundred twelve thousand, sixteen".