31140271 has 4 divisors (see below), whose sum is σ = 31165200. Its totient is φ = 31115344.

The previous prime is 31140257. The next prime is 31140289. The reversal of 31140271 is 17204113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31140271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31140251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10486 + ... + 13123.

It is an arithmetic number, because the mean of its divisors is an integer number (7791300).

Almost surely, 2^31140271 is an apocalyptic number.

31140271 is a deficient number, since it is larger than the sum of its proper divisors (24929).

31140271 is a wasteful number, since it uses less digits than its factorization.

31140271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24928.

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

The square root of 31140271 is about 5580.3468530191. The cubic root of 31140271 is about 314.6111637888.

Adding to 31140271 its reverse (17204113), we get a palindrome (48344384).

The spelling of 31140271 in words is "thirty-one million, one hundred forty thousand, two hundred seventy-one".