31878293311 has 2 divisors, whose sum is σ = 31878293312. Its totient is φ = 31878293310.

The previous prime is 31878293287. The next prime is 31878293357. The reversal of 31878293311 is 11339287813.

It is an a-pointer prime, because the next prime (31878293357) can be obtained adding 31878293311 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31878293311 - 2³³ = 23288358719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31878299311) 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, 15939146655 + 15939146656.

It is an arithmetic number, because the mean of its divisors is an integer number (15939146656).

Almost surely, 2^31878293311 is an apocalyptic number.

31878293311 is a deficient number, since it is larger than the sum of its proper divisors (1).

31878293311 is an equidigital number, since it uses as much as digits as its factorization.

31878293311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The spelling of 31878293311 in words is "thirty-one billion, eight hundred seventy-eight million, two hundred ninety-three thousand, three hundred eleven".