31431422 has 16 divisors (see below), whose sum is σ = 51520752. Its totient is φ = 14262720.

The previous prime is 31431403. The next prime is 31431443. The reversal of 31431422 is 22413413.

It is a junction number, because it is equal to n+sod(n) for n = 31431394 and 31431403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21218 + ... + 22650.

It is an arithmetic number, because the mean of its divisors is an integer number (3220047).

Almost surely, 2^31431422 is an apocalyptic number.

31431422 is a deficient number, since it is larger than the sum of its proper divisors (20089330).

31431422 is a wasteful number, since it uses less digits than its factorization.

31431422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443.

The product of its digits is 576, while the sum is 20.

The square root of 31431422 is about 5606.3733375508. The cubic root of 31431422 is about 315.5886264263.

Adding to 31431422 its reverse (22413413), we get a palindrome (53844835).

Subtracting from 31431422 its reverse (22413413), we obtain a square (9018009 = 3003²).

The spelling of 31431422 in words is "thirty-one million, four hundred thirty-one thousand, four hundred twenty-two".