3131121222 has 12 divisors (see below), whose sum is σ = 6784096020. Its totient is φ = 1043707068.

The previous prime is 3131121221. The next prime is 3131121223. The reversal of 3131121222 is 2221211313.

It is an interprime number because it is at equal distance from previous prime (3131121221) and next prime (3131121223).

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: 173951179 = 3131121222 / (3 + 1 + 3 + 1 + 1 + 2 + 1 + 2 + 2 + 2).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 3131121195 and 3131121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131121221) 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, 86975572 + ... + 86975607.

It is an arithmetic number, because the mean of its divisors is an integer number (565341335).

Almost surely, 2^3131121222 is an apocalyptic number.

3131121222 is an abundant number, since it is smaller than the sum of its proper divisors (3652974798).

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

3131121222 is a wasteful number, since it uses less digits than its factorization.

3131121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173951187 (or 173951184 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 3131121222 is about 55956.4225268199. The cubic root of 3131121222 is about 1462.9628364608.

Adding to 3131121222 its reverse (2221211313), we get a palindrome (5352332535).

Subtracting from 3131121222 its reverse (2221211313), we obtain a palindrome (909909909).

The spelling of 3131121222 in words is "three billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred twenty-two".