31040143 has 4 divisors (see below), whose sum is σ = 31052808. Its totient is φ = 31027480.

The previous prime is 31040137. The next prime is 31040153. The reversal of 31040143 is 34104013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31040143 - 2¹³ = 31031951 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 (31040153) 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, 1348 + ... + 7993.

It is an arithmetic number, because the mean of its divisors is an integer number (7763202).

Almost surely, 2^31040143 is an apocalyptic number.

31040143 is a deficient number, since it is larger than the sum of its proper divisors (12665).

31040143 is an equidigital number, since it uses as much as digits as its factorization.

31040143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12664.

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

The square root of 31040143 is about 5571.3681443610. The cubic root of 31040143 is about 314.2736029276.

Adding to 31040143 its reverse (34104013), we get a palindrome (65144156).

The spelling of 31040143 in words is "thirty-one million, forty thousand, one hundred forty-three".