194499153421 has 2 divisors, whose sum is σ = 194499153422. Its totient is φ = 194499153420.

The previous prime is 194499153403. The next prime is 194499153451. The reversal of 194499153421 is 124351994491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155599480521 + 38899672900 = 394461^2 + 197230^2 .

It is a cyclic number.

It is not a de Polignac number, because 194499153421 - 2⁹ = 194499152909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194499153451) 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, 97249576710 + 97249576711.

It is an arithmetic number, because the mean of its divisors is an integer number (97249576711).

Almost surely, 2^194499153421 is an apocalyptic number.

It is an amenable number.

194499153421 is a deficient number, since it is larger than the sum of its proper divisors (1).

194499153421 is an equidigital number, since it uses as much as digits as its factorization.

194499153421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The spelling of 194499153421 in words is "one hundred ninety-four billion, four hundred ninety-nine million, one hundred fifty-three thousand, four hundred twenty-one".