31271140 has 24 divisors (see below), whose sum is σ = 65774520. Its totient is φ = 12488448.

The previous prime is 31271137. The next prime is 31271147. The reversal of 31271140 is 4117213.

It can be written as a sum of positive squares in 4 ways, for example, as 1218816 + 30052324 = 1104^2 + 5482^2 .

It is not an unprimeable number, because it can be changed into a prime (31271147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23616 + ... + 24904.

It is an arithmetic number, because the mean of its divisors is an integer number (2740605).

Almost surely, 2^31271140 is an apocalyptic number.

It is an amenable number.

31271140 is an abundant number, since it is smaller than the sum of its proper divisors (34503380).

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

31271140 is a wasteful number, since it uses less digits than its factorization.

31271140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511 (or 2509 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 31271140 is about 5592.0604431640. The cubic root of 31271140 is about 315.0512724132.

Adding to 31271140 its reverse (4117213), we get a palindrome (35388353).

The spelling of 31271140 in words is "thirty-one million, two hundred seventy-one thousand, one hundred forty".