31344643 has 16 divisors (see below), whose sum is σ = 35030880. Its totient is φ = 27808000.

The previous prime is 31344631. The next prime is 31344671. The reversal of 31344643 is 34644313.

It is a de Polignac number, because none of the positive numbers 2^k-31344643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31344043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98721 + ... + 99037.

It is an arithmetic number, because the mean of its divisors is an integer number (2189430).

Almost surely, 2^31344643 is an apocalyptic number.

31344643 is a deficient number, since it is larger than the sum of its proper divisors (3686237).

31344643 is a wasteful number, since it uses less digits than its factorization.

31344643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its digits is 10368, while the sum is 28.

The square root of 31344643 is about 5598.6286713802. The cubic root of 31344643 is about 315.2979225578.

Adding to 31344643 its reverse (34644313), we get a palindrome (65988956).

It can be divided in two parts, 3134 and 4643, that added together give a palindrome (7777).

The spelling of 31344643 in words is "thirty-one million, three hundred forty-four thousand, six hundred forty-three".