31424404393 has 2 divisors, whose sum is σ = 31424404394. Its totient is φ = 31424404392.

The previous prime is 31424404337. The next prime is 31424404463. The reversal of 31424404393 is 39340442413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21221788329 + 10202616064 = 145677^2 + 101008^2 .

It is an emirp because it is prime and its reverse (39340442413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31424404393 is a prime.

It is not a weakly prime, because it can be changed into another prime (31424404303) 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, 15712202196 + 15712202197.

It is an arithmetic number, because the mean of its divisors is an integer number (15712202197).

Almost surely, 2^31424404393 is an apocalyptic number.

It is an amenable number.

31424404393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31424404393 is an equidigital number, since it uses as much as digits as its factorization.

31424404393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 37.

It can be divided in two parts, 31 and 424404393, that added together give a palindrome (424404424).

The spelling of 31424404393 in words is "thirty-one billion, four hundred twenty-four million, four hundred four thousand, three hundred ninety-three".