188711969 has 2 divisors, whose sum is σ = 188711970. Its totient is φ = 188711968.

The previous prime is 188711947. The next prime is 188711977. The reversal of 188711969 is 969117881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184960000 + 3751969 = 13600^2 + 1937^2 .

It is an emirp because it is prime and its reverse (969117881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188711969 is a prime.

It is a super-2 number, since 2×188711969² = 71224414487713922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (188701969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94355984 + 94355985.

It is an arithmetic number, because the mean of its divisors is an integer number (94355985).

Almost surely, 2^188711969 is an apocalyptic number.

It is an amenable number.

188711969 is a deficient number, since it is larger than the sum of its proper divisors (1).

188711969 is an equidigital number, since it uses as much as digits as its factorization.

188711969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 50.

The square root of 188711969 is about 13737.2475045039. The cubic root of 188711969 is about 573.5876809622.

The spelling of 188711969 in words is "one hundred eighty-eight million, seven hundred eleven thousand, nine hundred sixty-nine".