188661797 has 2 divisors, whose sum is σ = 188661798. Its totient is φ = 188661796.

The previous prime is 188661761. The next prime is 188661833. The reversal of 188661797 is 797166881.

It is a balanced prime because it is at equal distance from previous prime (188661761) and next prime (188661833).

It can be written as a sum of positive squares in only one way, i.e., 112169281 + 76492516 = 10591^2 + 8746^2 .

It is a cyclic number.

It is not a de Polignac number, because 188661797 - 2¹² = 188657701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188661757) 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, 94330898 + 94330899.

It is an arithmetic number, because the mean of its divisors is an integer number (94330899).

Almost surely, 2^188661797 is an apocalyptic number.

It is an amenable number.

188661797 is a deficient number, since it is larger than the sum of its proper divisors (1).

188661797 is an equidigital number, since it uses as much as digits as its factorization.

188661797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The square root of 188661797 is about 13735.4212530960. The cubic root of 188661797 is about 573.5368440668.

The spelling of 188661797 in words is "one hundred eighty-eight million, six hundred sixty-one thousand, seven hundred ninety-seven".