31431022 has 32 divisors (see below), whose sum is σ = 55756800. Its totient is φ = 13009248.

The previous prime is 31431017. The next prime is 31431031. The reversal of 31431022 is 22013413.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31430987 and 31431005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65379 + ... + 65857.

It is an arithmetic number, because the mean of its divisors is an integer number (1742400).

Almost surely, 2^31431022 is an apocalyptic number.

31431022 is a deficient number, since it is larger than the sum of its proper divisors (24325778).

31431022 is a wasteful number, since it uses less digits than its factorization.

31431022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31431022 is about 5606.3376637516. The cubic root of 31431022 is about 315.5872876812.

Adding to 31431022 its reverse (22013413), we get a palindrome (53444435).

The spelling of 31431022 in words is "thirty-one million, four hundred thirty-one thousand, twenty-two".