2188689521 has 2 divisors, whose sum is σ = 2188689522. Its totient is φ = 2188689520.

The previous prime is 2188689491. The next prime is 2188689533. The reversal of 2188689521 is 1259868812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1444000000 + 744689521 = 38000^2 + 27289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188689521 - 2⁶ = 2188689457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2188689521.

It is not a weakly prime, because it can be changed into another prime (2188689541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094344760 + 1094344761.

It is an arithmetic number, because the mean of its divisors is an integer number (1094344761).

Almost surely, 2^2188689521 is an apocalyptic number.

It is an amenable number.

2188689521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188689521 is an equidigital number, since it uses as much as digits as its factorization.

2188689521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 552960, while the sum is 50.

The square root of 2188689521 is about 46783.4321207840. The cubic root of 2188689521 is about 1298.3587811407.

The spelling of 2188689521 in words is "two billion, one hundred eighty-eight million, six hundred eighty-nine thousand, five hundred twenty-one".