3131222 has 4 divisors (see below), whose sum is σ = 4696836. Its totient is φ = 1565610.

The previous prime is 3131221. The next prime is 3131231. The reversal of 3131222 is 2221313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2221313 = 29 ⋅76597.

It is a junction number, because it is equal to n+sod(n) for n = 3131197 and 3131206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782804 + ... + 782807.

It is an arithmetic number, because the mean of its divisors is an integer number (1174209).

Almost surely, 2^3131222 is an apocalyptic number.

3131222 is a deficient number, since it is larger than the sum of its proper divisors (1565614).

3131222 is a wasteful number, since it uses less digits than its factorization.

3131222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565613.

The product of its digits is 72, while the sum is 14.

The square root of 3131222 is about 1769.5259252127. The cubic root of 3131222 is about 146.2978531891.

Adding to 3131222 its reverse (2221313), we get a palindrome (5352535).

Subtracting from 3131222 its reverse (2221313), we obtain a palindrome (909909).

The spelling of 3131222 in words is "three million, one hundred thirty-one thousand, two hundred twenty-two".