194182421 has 2 divisors, whose sum is σ = 194182422. Its totient is φ = 194182420.

The previous prime is 194182403. The next prime is 194182441. The reversal of 194182421 is 124281491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123454321 + 70728100 = 11111^2 + 8410^2 .

It is an emirp because it is prime and its reverse (124281491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194182421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194182441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97091210 + 97091211.

It is an arithmetic number, because the mean of its divisors is an integer number (97091211).

Almost surely, 2^194182421 is an apocalyptic number.

It is an amenable number.

194182421 is a deficient number, since it is larger than the sum of its proper divisors (1).

194182421 is an equidigital number, since it uses as much as digits as its factorization.

194182421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 194182421 is about 13934.9352707503. The cubic root of 194182421 is about 579.0774284628.

The spelling of 194182421 in words is "one hundred ninety-four million, one hundred eighty-two thousand, four hundred twenty-one".