31144244213 has 8 divisors (see below), whose sum is σ = 31377996888. Its totient is φ = 30911238144.

The previous prime is 31144244191. The next prime is 31144244249. The reversal of 31144244213 is 31244244113.

It can be written as a sum of positive squares in 4 ways, for example, as 703416484 + 30440827729 = 26522^2 + 174473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31144244213 - 2¹⁰ = 31144243189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144244413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102770 + ... + 269907.

It is an arithmetic number, because the mean of its divisors is an integer number (3922249611).

Almost surely, 2^31144244213 is an apocalyptic number.

It is an amenable number.

31144244213 is a deficient number, since it is larger than the sum of its proper divisors (233752675).

31144244213 is a wasteful number, since it uses less digits than its factorization.

31144244213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373303.

The product of its digits is 9216, while the sum is 29.

Adding to 31144244213 its reverse (31244244113), we get a palindrome (62388488326).

The spelling of 31144244213 in words is "thirty-one billion, one hundred forty-four million, two hundred forty-four thousand, two hundred thirteen".