2111867761 has 2 divisors, whose sum is σ = 2111867762. Its totient is φ = 2111867760.

The previous prime is 2111867749. The next prime is 2111867861. The reversal of 2111867761 is 1677681112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1817402161 + 294465600 = 42631^2 + 17160^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111867761 - 2⁹ = 2111867249 is a prime.

It is not a weakly prime, because it can be changed into another prime (2111867701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055933880 + 1055933881.

It is an arithmetic number, because the mean of its divisors is an integer number (1055933881).

Almost surely, 2^2111867761 is an apocalyptic number.

It is an amenable number.

2111867761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111867761 is an equidigital number, since it uses as much as digits as its factorization.

2111867761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 40.

The square root of 2111867761 is about 45955.0624088359. The cubic root of 2111867761 is about 1282.9869535902.

The spelling of 2111867761 in words is "two billion, one hundred eleven million, eight hundred sixty-seven thousand, seven hundred sixty-one".