187851121 has 2 divisors, whose sum is σ = 187851122. Its totient is φ = 187851120.

The previous prime is 187851107. The next prime is 187851127. The reversal of 187851121 is 121158781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187388721 + 462400 = 13689^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 187851121 - 2⁵ = 187851089 is a prime.

It is not a weakly prime, because it can be changed into another prime (187851127) 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, 93925560 + 93925561.

It is an arithmetic number, because the mean of its divisors is an integer number (93925561).

Almost surely, 2^187851121 is an apocalyptic number.

It is an amenable number.

187851121 is a deficient number, since it is larger than the sum of its proper divisors (1).

187851121 is an equidigital number, since it uses as much as digits as its factorization.

187851121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 34.

The square root of 187851121 is about 13705.8790670281. The cubic root of 187851121 is about 572.7141724566.

The spelling of 187851121 in words is "one hundred eighty-seven million, eight hundred fifty-one thousand, one hundred twenty-one".