188989531261 has 2 divisors, whose sum is σ = 188989531262. Its totient is φ = 188989531260.

The previous prime is 188989531249. The next prime is 188989531271. The reversal of 188989531261 is 162135989881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183607108036 + 5382423225 = 428494^2 + 73365^2 .

It is an emirp because it is prime and its reverse (162135989881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 188989531261 - 2⁵ = 188989531229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 188989531261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188989531271) 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, 94494765630 + 94494765631.

It is an arithmetic number, because the mean of its divisors is an integer number (94494765631).

Almost surely, 2^188989531261 is an apocalyptic number.

It is an amenable number.

188989531261 is a deficient number, since it is larger than the sum of its proper divisors (1).

188989531261 is an equidigital number, since it uses as much as digits as its factorization.

188989531261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 61.

The spelling of 188989531261 in words is "one hundred eighty-eight billion, nine hundred eighty-nine million, five hundred thirty-one thousand, two hundred sixty-one".