1211989931767 has 2 divisors, whose sum is σ = 1211989931768. Its totient is φ = 1211989931766.

The previous prime is 1211989931731. The next prime is 1211989931773. The reversal of 1211989931767 is 7671399891121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211989931767 - 2³¹ = 1209842448119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211989931699 and 1211989931708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211989431767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605994965883 + 605994965884.

It is an arithmetic number, because the mean of its divisors is an integer number (605994965884).

Almost surely, 2^{1211989931767} is an apocalyptic number.

1211989931767 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211989931767 is an equidigital number, since it uses as much as digits as its factorization.

1211989931767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 64.

The spelling of 1211989931767 in words is "one trillion, two hundred eleven billion, nine hundred eighty-nine million, nine hundred thirty-one thousand, seven hundred sixty-seven".