31430878811 has 2 divisors, whose sum is σ = 31430878812. Its totient is φ = 31430878810.

The previous prime is 31430878793. The next prime is 31430878813. The reversal of 31430878811 is 11887803413.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31430878811 is a prime.

Together with 31430878813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31430878813) 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, 15715439405 + 15715439406.

It is an arithmetic number, because the mean of its divisors is an integer number (15715439406).

Almost surely, 2^31430878811 is an apocalyptic number.

31430878811 is a deficient number, since it is larger than the sum of its proper divisors (1).

31430878811 is an equidigital number, since it uses as much as digits as its factorization.

31430878811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 31430878811 in words is "thirty-one billion, four hundred thirty million, eight hundred seventy-eight thousand, eight hundred eleven".