187794913 has 2 divisors, whose sum is σ = 187794914. Its totient is φ = 187794912.

The previous prime is 187794911. The next prime is 187794947. The reversal of 187794913 is 319497781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148644864 + 39150049 = 12192^2 + 6257^2 .

It is an emirp because it is prime and its reverse (319497781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 187794913 - 2¹ = 187794911 is a prime.

Together with 187794911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (187794911) 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, 93897456 + 93897457.

It is an arithmetic number, because the mean of its divisors is an integer number (93897457).

Almost surely, 2^187794913 is an apocalyptic number.

It is an amenable number.

187794913 is a deficient number, since it is larger than the sum of its proper divisors (1).

187794913 is an equidigital number, since it uses as much as digits as its factorization.

187794913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 187794913 is about 13703.8284066899. The cubic root of 187794913 is about 572.6570450725.

The spelling of 187794913 in words is "one hundred eighty-seven million, seven hundred ninety-four thousand, nine hundred thirteen".