194961649 has 2 divisors, whose sum is σ = 194961650. Its totient is φ = 194961648.

The previous prime is 194961647. The next prime is 194961653. The reversal of 194961649 is 946169491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133056225 + 61905424 = 11535^2 + 7868^2 .

It is a cyclic number.

It is not a de Polignac number, because 194961649 - 2¹ = 194961647 is a prime.

Together with 194961647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (194961643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97480824 + 97480825.

It is an arithmetic number, because the mean of its divisors is an integer number (97480825).

Almost surely, 2^194961649 is an apocalyptic number.

It is an amenable number.

194961649 is a deficient number, since it is larger than the sum of its proper divisors (1).

194961649 is an equidigital number, since it uses as much as digits as its factorization.

194961649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 194961649 is about 13962.8667901688. The cubic root of 194961649 is about 579.8509813356.

The spelling of 194961649 in words is "one hundred ninety-four million, nine hundred sixty-one thousand, six hundred forty-nine".