187045421 has 2 divisors, whose sum is σ = 187045422. Its totient is φ = 187045420.

The previous prime is 187045379. The next prime is 187045423. The reversal of 187045421 is 124540781.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186622921 + 422500 = 13661^2 + 650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187045421 is a prime.

Together with 187045423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187045423) 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, 93522710 + 93522711.

It is an arithmetic number, because the mean of its divisors is an integer number (93522711).

Almost surely, 2^187045421 is an apocalyptic number.

It is an amenable number.

187045421 is a deficient number, since it is larger than the sum of its proper divisors (1).

187045421 is an equidigital number, since it uses as much as digits as its factorization.

187045421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 187045421 is about 13676.4549865819. The cubic root of 187045421 is about 571.8942020327.

The spelling of 187045421 in words is "one hundred eighty-seven million, forty-five thousand, four hundred twenty-one".