31143043 has 4 divisors (see below), whose sum is σ = 31181440. Its totient is φ = 31104648.

The previous prime is 31143029. The next prime is 31143053. The reversal of 31143043 is 34034113.

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-31143043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31143043.

It is not an unprimeable number, because it can be changed into a prime (31143053) 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 3 ways as a sum of consecutive naturals, for example, 17955 + ... + 19612.

It is an arithmetic number, because the mean of its divisors is an integer number (7795360).

Almost surely, 2^31143043 is an apocalyptic number.

31143043 is a deficient number, since it is larger than the sum of its proper divisors (38397).

31143043 is an equidigital number, since it uses as much as digits as its factorization.

31143043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38396.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 31143043 is about 5580.5952191500. The cubic root of 31143043 is about 314.6204987137.

Adding to 31143043 its reverse (34034113), we get a palindrome (65177156).

The spelling of 31143043 in words is "thirty-one million, one hundred forty-three thousand, forty-three".