31143343313 has 2 divisors, whose sum is σ = 31143343314. Its totient is φ = 31143343312.

The previous prime is 31143343277. The next prime is 31143343337. The reversal of 31143343313 is 31334334113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20188999744 + 10954343569 = 142088^2 + 104663^2 .

It is an emirp because it is prime and its reverse (31334334113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31143343313 is a prime.

It is a super-2 number, since 2×31143343313² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31143346313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571671656 + 15571671657.

It is an arithmetic number, because the mean of its divisors is an integer number (15571671657).

Almost surely, 2^31143343313 is an apocalyptic number.

It is an amenable number.

31143343313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143343313 is an equidigital number, since it uses as much as digits as its factorization.

31143343313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 29.

Adding to 31143343313 its reverse (31334334113), we get a palindrome (62477677426).

The spelling of 31143343313 in words is "thirty-one billion, one hundred forty-three million, three hundred forty-three thousand, three hundred thirteen".