1894119987649 has 2 divisors, whose sum is σ = 1894119987650. Its totient is φ = 1894119987648.

The previous prime is 1894119987647. The next prime is 1894119987691. The reversal of 1894119987649 is 9467899114981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1284833585025 + 609286402624 = 1133505^2 + 780568^2 .

It is a cyclic number.

It is not a de Polignac number, because 1894119987649 - 2¹ = 1894119987647 is a prime.

It is a super-2 number, since 2×1894119987649² (a number of 25 digits) contains 22 as substring.

Together with 1894119987647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1894119987647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 947059993824 + 947059993825.

It is an arithmetic number, because the mean of its divisors is an integer number (947059993825).

Almost surely, 2^{1894119987649} is an apocalyptic number.

It is an amenable number.

1894119987649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1894119987649 is an equidigital number, since it uses as much as digits as its factorization.

1894119987649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282175488, while the sum is 76.

The spelling of 1894119987649 in words is "one trillion, eight hundred ninety-four billion, one hundred nineteen million, nine hundred eighty-seven thousand, six hundred forty-nine".