1989812064311 has 2 divisors, whose sum is σ = 1989812064312. Its totient is φ = 1989812064310.

The previous prime is 1989812064221. The next prime is 1989812064379. The reversal of 1989812064311 is 1134602189891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1989812064311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989812064511) 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, 994906032155 + 994906032156.

It is an arithmetic number, because the mean of its divisors is an integer number (994906032156).

Almost surely, 2^{1989812064311} is an apocalyptic number.

1989812064311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989812064311 is an equidigital number, since it uses as much as digits as its factorization.

1989812064311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 53.

The spelling of 1989812064311 in words is "one trillion, nine hundred eighty-nine billion, eight hundred twelve million, sixty-four thousand, three hundred eleven".