31366261393 has 2 divisors, whose sum is σ = 31366261394. Its totient is φ = 31366261392.

The previous prime is 31366261369. The next prime is 31366261441. The reversal of 31366261393 is 39316266313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23247710784 + 8118550609 = 152472^2 + 90103^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31366261393 is a prime.

It is not a weakly prime, because it can be changed into another prime (31366261363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15683130696 + 15683130697.

It is an arithmetic number, because the mean of its divisors is an integer number (15683130697).

Almost surely, 2^31366261393 is an apocalyptic number.

It is an amenable number.

31366261393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31366261393 is an equidigital number, since it uses as much as digits as its factorization.

31366261393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 43.

The spelling of 31366261393 in words is "thirty-one billion, three hundred sixty-six million, two hundred sixty-one thousand, three hundred ninety-three".