31013443 has 4 divisors (see below), whose sum is σ = 31298080. Its totient is φ = 30728808.

The previous prime is 31013431. The next prime is 31013461. The reversal of 31013443 is 34431013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34431013 = 379 ⋅90847.

It is a cyclic number.

It is not a de Polignac number, because 31013443 - 2⁹ = 31012931 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 31013443.

It is not an unprimeable number, because it can be changed into a prime (31013473) 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, 142155 + ... + 142372.

It is an arithmetic number, because the mean of its divisors is an integer number (7824520).

Almost surely, 2^31013443 is an apocalyptic number.

31013443 is a deficient number, since it is larger than the sum of its proper divisors (284637).

31013443 is a wasteful number, since it uses less digits than its factorization.

31013443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284636.

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

The square root of 31013443 is about 5568.9714490200. The cubic root of 31013443 is about 314.1834668277.

Adding to 31013443 its reverse (34431013), we get a palindrome (65444456).

The spelling of 31013443 in words is "thirty-one million, thirteen thousand, four hundred forty-three".