31218855211 has 2 divisors, whose sum is σ = 31218855212. Its totient is φ = 31218855210.

The previous prime is 31218855169. The next prime is 31218855229. The reversal of 31218855211 is 11255881213.

It is a strong prime.

It is an emirp because it is prime and its reverse (11255881213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31218855211 - 2²¹ = 31216758059 is a prime.

It is not a weakly prime, because it can be changed into another prime (31218852211) 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, 15609427605 + 15609427606.

It is an arithmetic number, because the mean of its divisors is an integer number (15609427606).

Almost surely, 2^31218855211 is an apocalyptic number.

31218855211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31218855211 is an equidigital number, since it uses as much as digits as its factorization.

31218855211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 37.

The spelling of 31218855211 in words is "thirty-one billion, two hundred eighteen million, eight hundred fifty-five thousand, two hundred eleven".