31431126 has 16 divisors (see below), whose sum is σ = 62967744. Its totient is φ = 10459464.

The previous prime is 31431121. The next prime is 31431137. The reversal of 31431126 is 62113413.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431121) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 216 + ... + 7931.

It is an arithmetic number, because the mean of its divisors is an integer number (3935484).

Almost surely, 2^31431126 is an apocalyptic number.

31431126 is an abundant number, since it is smaller than the sum of its proper divisors (31536618).

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

31431126 is a wasteful number, since it uses less digits than its factorization.

31431126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8795.

The product of its digits is 432, while the sum is 21.

The square root of 31431126 is about 5606.3469389612. The cubic root of 31431126 is about 315.5876357560.

Adding to 31431126 its reverse (62113413), we get a palindrome (93544539).

The spelling of 31431126 in words is "thirty-one million, four hundred thirty-one thousand, one hundred twenty-six".