31222144 has 32 divisors (see below), whose sum is σ = 62466840. Its totient is φ = 15544320.

The previous prime is 31222133. The next prime is 31222157. The reversal of 31222144 is 44122213.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44839 + ... + 45529.

Almost surely, 2^31222144 is an apocalyptic number.

It is an amenable number.

31222144 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

31222144 is an equidigital number, since it uses as much as digits as its factorization.

31222144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058 (or 1046 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 31222144 is about 5587.6778718892. The cubic root of 31222144 is about 314.8866443560.

Adding to 31222144 its reverse (44122213), we get a palindrome (75344357).

The spelling of 31222144 in words is "thirty-one million, two hundred twenty-two thousand, one hundred forty-four".