187822561 has 2 divisors, whose sum is σ = 187822562. Its totient is φ = 187822560.

The previous prime is 187822519. The next prime is 187822601. The reversal of 187822561 is 165228781.

It is an a-pointer prime, because the next prime (187822601) can be obtained adding 187822561 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165920161 + 21902400 = 12881^2 + 4680^2 .

It is a cyclic number.

It is not a de Polignac number, because 187822561 - 2¹³ = 187814369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (187822861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93911280 + 93911281.

It is an arithmetic number, because the mean of its divisors is an integer number (93911281).

Almost surely, 2^187822561 is an apocalyptic number.

It is an amenable number.

187822561 is a deficient number, since it is larger than the sum of its proper divisors (1).

187822561 is an equidigital number, since it uses as much as digits as its factorization.

187822561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 40.

The square root of 187822561 is about 13704.8371387624. The cubic root of 187822561 is about 572.6851467302.

The spelling of 187822561 in words is "one hundred eighty-seven million, eight hundred twenty-two thousand, five hundred sixty-one".