2188711813 has 2 divisors, whose sum is σ = 2188711814. Its totient is φ = 2188711812.

The previous prime is 2188711771. The next prime is 2188711831. The reversal of 2188711813 is 3181178812.

Together with next prime (2188711831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1293625089 + 895086724 = 35967^2 + 29918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2188711813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2188711883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094355906 + 1094355907.

It is an arithmetic number, because the mean of its divisors is an integer number (1094355907).

Almost surely, 2^2188711813 is an apocalyptic number.

It is an amenable number.

2188711813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188711813 is an equidigital number, since it uses as much as digits as its factorization.

2188711813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 40.

The square root of 2188711813 is about 46783.6703669133. The cubic root of 2188711813 is about 1298.3631890928.

The spelling of 2188711813 in words is "two billion, one hundred eighty-eight million, seven hundred eleven thousand, eight hundred thirteen".