188770649 has 2 divisors, whose sum is σ = 188770650. Its totient is φ = 188770648.

The previous prime is 188770619. The next prime is 188770651. The reversal of 188770649 is 946077881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99600400 + 89170249 = 9980^2 + 9443^2 .

It is a cyclic number.

It is not a de Polignac number, because 188770649 - 2¹² = 188766553 is a prime.

It is a Sophie Germain prime.

Together with 188770651, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 188770597 and 188770606.

It is not a weakly prime, because it can be changed into another prime (188770619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94385324 + 94385325.

It is an arithmetic number, because the mean of its divisors is an integer number (94385325).

Almost surely, 2^188770649 is an apocalyptic number.

It is an amenable number.

188770649 is a deficient number, since it is larger than the sum of its proper divisors (1).

188770649 is an equidigital number, since it uses as much as digits as its factorization.

188770649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 188770649 is about 13739.3831375357. The cubic root of 188770649 is about 573.6471271775.

The spelling of 188770649 in words is "one hundred eighty-eight million, seven hundred seventy thousand, six hundred forty-nine".