194331649 has 2 divisors, whose sum is σ = 194331650. Its totient is φ = 194331648.

The previous prime is 194331647. The next prime is 194331667. The reversal of 194331649 is 946133491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169650625 + 24681024 = 13025^2 + 4968^2 .

It is a cyclic number.

It is not a de Polignac number, because 194331649 - 2¹ = 194331647 is a prime.

Together with 194331647, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194331647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97165824 + 97165825.

It is an arithmetic number, because the mean of its divisors is an integer number (97165825).

Almost surely, 2^194331649 is an apocalyptic number.

It is an amenable number.

194331649 is a deficient number, since it is larger than the sum of its proper divisors (1).

194331649 is an equidigital number, since it uses as much as digits as its factorization.

194331649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 40.

The square root of 194331649 is about 13940.2886985887. The cubic root of 194331649 is about 579.2257296310.

The spelling of 194331649 in words is "one hundred ninety-four million, three hundred thirty-one thousand, six hundred forty-nine".