31440243413 has 2 divisors, whose sum is σ = 31440243414. Its totient is φ = 31440243412.

The previous prime is 31440243409. The next prime is 31440243463. The reversal of 31440243413 is 31434204413.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31406219524 + 34023889 = 177218^2 + 5833^2 .

It is an emirp because it is prime and its reverse (31434204413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31440243413 - 2² = 31440243409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31440243463) 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 as a sum of consecutive naturals, namely, 15720121706 + 15720121707.

It is an arithmetic number, because the mean of its divisors is an integer number (15720121707).

Almost surely, 2^31440243413 is an apocalyptic number.

It is an amenable number.

31440243413 is a deficient number, since it is larger than the sum of its proper divisors (1).

31440243413 is an equidigital number, since it uses as much as digits as its factorization.

31440243413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 31440243413 its reverse (31434204413), we get a palindrome (62874447826).

The spelling of 31440243413 in words is "thirty-one billion, four hundred forty million, two hundred forty-three thousand, four hundred thirteen".