194766421 has 2 divisors, whose sum is σ = 194766422. Its totient is φ = 194766420.

The previous prime is 194766413. The next prime is 194766437. The reversal of 194766421 is 124667491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132135025 + 62631396 = 11495^2 + 7914^2 .

It is a cyclic number.

It is not a de Polignac number, because 194766421 - 2³ = 194766413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194761421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97383210 + 97383211.

It is an arithmetic number, because the mean of its divisors is an integer number (97383211).

Almost surely, 2^194766421 is an apocalyptic number.

It is an amenable number.

194766421 is a deficient number, since it is larger than the sum of its proper divisors (1).

194766421 is an equidigital number, since it uses as much as digits as its factorization.

194766421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 194766421 is about 13955.8740679328. The cubic root of 194766421 is about 579.6573689766.

The spelling of 194766421 in words is "one hundred ninety-four million, seven hundred sixty-six thousand, four hundred twenty-one".