31430878793 has 2 divisors, whose sum is σ = 31430878794. Its totient is φ = 31430878792.

The previous prime is 31430878783. The next prime is 31430878811. The reversal of 31430878793 is 39787803413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29341291849 + 2089586944 = 171293^2 + 45712^2 .

It is an emirp because it is prime and its reverse (39787803413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31430878793 - 2⁸ = 31430878537 is a prime.

It is not a weakly prime, because it can be changed into another prime (31430878783) 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, 15715439396 + 15715439397.

It is an arithmetic number, because the mean of its divisors is an integer number (15715439397).

Almost surely, 2^31430878793 is an apocalyptic number.

It is an amenable number.

31430878793 is a deficient number, since it is larger than the sum of its proper divisors (1).

31430878793 is an equidigital number, since it uses as much as digits as its factorization.

31430878793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 31430878793 in words is "thirty-one billion, four hundred thirty million, eight hundred seventy-eight thousand, seven hundred ninety-three".