212831316 has 18 divisors (see below), whose sum is σ = 537990362. Its totient is φ = 70943760.

The previous prime is 212831309. The next prime is 212831317. The reversal of 212831316 is 613138212.

It is a happy number.

212831316 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 160123716 + 52707600 = 12654^2 + 7260^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 212831316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212831317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2955955 + ... + 2956026.

Almost surely, 2^212831316 is an apocalyptic number.

It is an amenable number.

212831316 is an abundant number, since it is smaller than the sum of its proper divisors (325159046).

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

212831316 is a wasteful number, since it uses less digits than its factorization.

212831316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911991 (or 5911986 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 212831316 is about 14588.7393560924. The cubic root of 212831316 is about 597.0515683172.

Adding to 212831316 its reverse (613138212), we get a palindrome (825969528).

The spelling of 212831316 in words is "two hundred twelve million, eight hundred thirty-one thousand, three hundred sixteen".