1919661041 has 4 divisors (see below), whose sum is σ = 1966482084. Its totient is φ = 1872840000.

The previous prime is 1919661013. The next prime is 1919661043. The reversal of 1919661041 is 1401669191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 659411041 + 1260250000 = 25679^2 + 35500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1919661041 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1919660986 and 1919661004.

It is not an unprimeable number, because it can be changed into a prime (1919661043) 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 in 3 ways as a sum of consecutive naturals, for example, 23410460 + ... + 23410541.

It is an arithmetic number, because the mean of its divisors is an integer number (491620521).

Almost surely, 2^1919661041 is an apocalyptic number.

It is an amenable number.

1919661041 is a deficient number, since it is larger than the sum of its proper divisors (46821043).

1919661041 is an equidigital number, since it uses as much as digits as its factorization.

1919661041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46821042.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 1919661041 is about 43813.9366069747. The cubic root of 1919661041 is about 1242.8198574921.

The spelling of 1919661041 in words is "one billion, nine hundred nineteen million, six hundred sixty-one thousand, forty-one".