31244144143 has 4 divisors (see below), whose sum is σ = 31244866120. Its totient is φ = 31243422168.

The previous prime is 31244144053. The next prime is 31244144147. The reversal of 31244144143 is 34144144213.

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-31244144143 is a prime.

It is a super-2 number, since 2×31244144143² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31244144147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291633 + ... + 384106.

It is an arithmetic number, because the mean of its divisors is an integer number (7811216530).

Almost surely, 2^31244144143 is an apocalyptic number.

31244144143 is a deficient number, since it is larger than the sum of its proper divisors (721977).

31244144143 is an equidigital number, since it uses as much as digits as its factorization.

31244144143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721976.

The product of its digits is 18432, while the sum is 31.

Adding to 31244144143 its reverse (34144144213), we get a palindrome (65388288356).

The spelling of 31244144143 in words is "thirty-one billion, two hundred forty-four million, one hundred forty-four thousand, one hundred forty-three".