189804810649 has 2 divisors, whose sum is σ = 189804810650. Its totient is φ = 189804810648.

The previous prime is 189804810563. The next prime is 189804810667. The reversal of 189804810649 is 946018408981.

189804810649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137073955225 + 52730855424 = 370235^2 + 229632^2 .

It is an emirp because it is prime and its reverse (946018408981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189804810649 - 2²³ = 189796422041 is a prime.

It is a super-2 number, since 2×189804810649² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 189804810593 and 189804810602.

It is not a weakly prime, because it can be changed into another prime (189804810049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94902405324 + 94902405325.

It is an arithmetic number, because the mean of its divisors is an integer number (94902405325).

Almost surely, 2^189804810649 is an apocalyptic number.

It is an amenable number.

189804810649 is a deficient number, since it is larger than the sum of its proper divisors (1).

189804810649 is an equidigital number, since it uses as much as digits as its factorization.

189804810649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3981312, while the sum is 58.

The spelling of 189804810649 in words is "one hundred eighty-nine billion, eight hundred four million, eight hundred ten thousand, six hundred forty-nine".