187848943621 has 2 divisors, whose sum is σ = 187848943622. Its totient is φ = 187848943620.

The previous prime is 187848943609. The next prime is 187848943657. The reversal of 187848943621 is 126349848781.

187848943621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185920504225 + 1928439396 = 431185^2 + 43914^2 .

It is a cyclic number.

It is not a de Polignac number, because 187848943621 - 2⁷ = 187848943493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 187848943621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187848943661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93924471810 + 93924471811.

It is an arithmetic number, because the mean of its divisors is an integer number (93924471811).

Almost surely, 2^187848943621 is an apocalyptic number.

It is an amenable number.

187848943621 is a deficient number, since it is larger than the sum of its proper divisors (1).

187848943621 is an equidigital number, since it uses as much as digits as its factorization.

187848943621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18579456, while the sum is 61.

The spelling of 187848943621 in words is "one hundred eighty-seven billion, eight hundred forty-eight million, nine hundred forty-three thousand, six hundred twenty-one".