194984989 has 2 divisors, whose sum is σ = 194984990. Its totient is φ = 194984988.

The previous prime is 194984987. The next prime is 194985017. The reversal of 194984989 is 989489491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115025625 + 79959364 = 10725^2 + 8942^2 .

It is a cyclic number.

It is not a de Polignac number, because 194984989 - 2¹ = 194984987 is a prime.

Together with 194984987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194984981) 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, 97492494 + 97492495.

It is an arithmetic number, because the mean of its divisors is an integer number (97492495).

Almost surely, 2^194984989 is an apocalyptic number.

It is an amenable number.

194984989 is a deficient number, since it is larger than the sum of its proper divisors (1).

194984989 is an equidigital number, since it uses as much as digits as its factorization.

194984989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 61.

The square root of 194984989 is about 13963.7025534061. The cubic root of 194984989 is about 579.8741195305.

The spelling of 194984989 in words is "one hundred ninety-four million, nine hundred eighty-four thousand, nine hundred eighty-nine".