1919380657 has 2 divisors, whose sum is σ = 1919380658. Its totient is φ = 1919380656.

The previous prime is 1919380649. The next prime is 1919380693. The reversal of 1919380657 is 7560839191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1583721616 + 335659041 = 39796^2 + 18321^2 .

It is an emirp because it is prime and its reverse (7560839191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1919380657 - 2³ = 1919380649 is a prime.

It is a super-3 number, since 3×1919380657³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1919380657.

It is not a weakly prime, because it can be changed into another prime (1919380607) 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, 959690328 + 959690329.

It is an arithmetic number, because the mean of its divisors is an integer number (959690329).

Almost surely, 2^1919380657 is an apocalyptic number.

It is an amenable number.

1919380657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919380657 is an equidigital number, since it uses as much as digits as its factorization.

1919380657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 1919380657 is about 43810.7367776439. The cubic root of 1919380657 is about 1242.7593461548.

The spelling of 1919380657 in words is "one billion, nine hundred nineteen million, three hundred eighty thousand, six hundred fifty-seven".