31268217389 has 2 divisors, whose sum is σ = 31268217390. Its totient is φ = 31268217388.

The previous prime is 31268217367. The next prime is 31268217401. The reversal of 31268217389 is 98371286213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28246516489 + 3021700900 = 168067^2 + 54970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31268217389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31268217319) 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, 15634108694 + 15634108695.

It is an arithmetic number, because the mean of its divisors is an integer number (15634108695).

Almost surely, 2^31268217389 is an apocalyptic number.

It is an amenable number.

31268217389 is a deficient number, since it is larger than the sum of its proper divisors (1).

31268217389 is an equidigital number, since it uses as much as digits as its factorization.

31268217389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The spelling of 31268217389 in words is "thirty-one billion, two hundred sixty-eight million, two hundred seventeen thousand, three hundred eighty-nine".