31140243 has 12 divisors (see below), whose sum is σ = 47626488. Its totient is φ = 19538880.

The previous prime is 31140233. The next prime is 31140251. The reversal of 31140243 is 34204113.

It is not a de Polignac number, because 31140243 - 2¹⁷ = 31009171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31140233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101613 + ... + 101918.

It is an arithmetic number, because the mean of its divisors is an integer number (3968874).

Almost surely, 2^31140243 is an apocalyptic number.

31140243 is a deficient number, since it is larger than the sum of its proper divisors (16486245).

31140243 is a wasteful number, since it uses less digits than its factorization.

31140243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203554 (or 203551 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31140243 is about 5580.3443442139. The cubic root of 31140243 is about 314.6110694938.

Adding to 31140243 its reverse (34204113), we get a palindrome (65344356).

The spelling of 31140243 in words is "thirty-one million, one hundred forty thousand, two hundred forty-three".