1211111963 has 2 divisors, whose sum is σ = 1211111964. Its totient is φ = 1211111962.

The previous prime is 1211111929. The next prime is 1211111981. The reversal of 1211111963 is 3691111121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211111963 - 2²⁴ = 1194334747 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211111063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605555981 + 605555982.

It is an arithmetic number, because the mean of its divisors is an integer number (605555982).

Almost surely, 2^1211111963 is an apocalyptic number.

1211111963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211111963 is an equidigital number, since it uses as much as digits as its factorization.

1211111963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 26.

The square root of 1211111963 is about 34801.0339357899. The cubic root of 1211111963 is about 1065.9285583855.

The spelling of 1211111963 in words is "one billion, two hundred eleven million, one hundred eleven thousand, nine hundred sixty-three".