31040043 has 4 divisors (see below), whose sum is σ = 41386728. Its totient is φ = 20693360.

The previous prime is 31040029. The next prime is 31040047. The reversal of 31040043 is 34004013.

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

It is a cyclic number.

It is not a de Polignac number, because 31040043 - 2¹⁴ = 31023659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31040047) 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, 5173338 + ... + 5173343.

It is an arithmetic number, because the mean of its divisors is an integer number (10346682).

Almost surely, 2^31040043 is an apocalyptic number.

31040043 is a deficient number, since it is larger than the sum of its proper divisors (10346685).

31040043 is a wasteful number, since it uses less digits than its factorization.

31040043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10346684.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 31040043 is about 5571.3591698974. The cubic root of 31040043 is about 314.2732654357.

Adding to 31040043 its reverse (34004013), we get a palindrome (65044056).

The spelling of 31040043 in words is "thirty-one million, forty thousand, forty-three".