187368521 has 2 divisors, whose sum is σ = 187368522. Its totient is φ = 187368520.

The previous prime is 187368497. The next prime is 187368527. The reversal of 187368521 is 125863781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185940496 + 1428025 = 13636^2 + 1195^2 .

It is an emirp because it is prime and its reverse (125863781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 187368521 - 2²² = 183174217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (187368527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93684260 + 93684261.

It is an arithmetic number, because the mean of its divisors is an integer number (93684261).

Almost surely, 2^187368521 is an apocalyptic number.

It is an amenable number.

187368521 is a deficient number, since it is larger than the sum of its proper divisors (1).

187368521 is an equidigital number, since it uses as much as digits as its factorization.

187368521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 187368521 is about 13688.2621614287. The cubic root of 187368521 is about 572.2233069861.

The spelling of 187368521 in words is "one hundred eighty-seven million, three hundred sixty-eight thousand, five hundred twenty-one".