3131220212 has 6 divisors (see below), whose sum is σ = 5479635378. Its totient is φ = 1565610104.

The previous prime is 3131220187. The next prime is 3131220233. The reversal of 3131220212 is 2120221313.

It can be written as a sum of positive squares in only one way, i.e., 3006986896 + 124233316 = 54836^2 + 11146^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391402523 + ... + 391402530.

It is an arithmetic number, because the mean of its divisors is an integer number (913272563).

Almost surely, 2^3131220212 is an apocalyptic number.

It is an amenable number.

3131220212 is a deficient number, since it is larger than the sum of its proper divisors (2348415166).

3131220212 is a wasteful number, since it uses less digits than its factorization.

3131220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782805057 (or 782805055 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 3131220212 is about 55957.3070474268. The cubic root of 3131220212 is about 1462.9782534265.

Adding to 3131220212 its reverse (2120221313), we get a palindrome (5251441525).

The spelling of 3131220212 in words is "three billion, one hundred thirty-one million, two hundred twenty thousand, two hundred twelve".