1889719649 has 2 divisors, whose sum is σ = 1889719650. Its totient is φ = 1889719648.

The previous prime is 1889719627. The next prime is 1889719697. The reversal of 1889719649 is 9469179881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1494982225 + 394737424 = 38665^2 + 19868^2 .

It is a cyclic number.

It is not a de Polignac number, because 1889719649 - 2¹⁶ = 1889654113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1889719591 and 1889719600.

It is not a weakly prime, because it can be changed into another prime (1889709649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944859824 + 944859825.

It is an arithmetic number, because the mean of its divisors is an integer number (944859825).

Almost surely, 2^1889719649 is an apocalyptic number.

It is an amenable number.

1889719649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889719649 is an equidigital number, since it uses as much as digits as its factorization.

1889719649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 62.

The square root of 1889719649 is about 43470.9057761625. The cubic root of 1889719649 is about 1236.3244543030.

The spelling of 1889719649 in words is "one billion, eight hundred eighty-nine million, seven hundred nineteen thousand, six hundred forty-nine".