1919031361 has 4 divisors (see below), whose sum is σ = 2066649172. Its totient is φ = 1771413552.

The previous prime is 1919031299. The next prime is 1919031397. The reversal of 1919031361 is 1631309191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1631309191 = 233 ⋅7001327.

It can be written as a sum of positive squares in 2 ways, for example, as 308213136 + 1610818225 = 17556^2 + 40135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1919031361 - 2⁹ = 1919030849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1919034361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73808886 + ... + 73808911.

It is an arithmetic number, because the mean of its divisors is an integer number (516662293).

Almost surely, 2^1919031361 is an apocalyptic number.

It is an amenable number.

1919031361 is a deficient number, since it is larger than the sum of its proper divisors (147617811).

1919031361 is a wasteful number, since it uses less digits than its factorization.

1919031361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147617810.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 1919031361 is about 43806.7501762000. The cubic root of 1919031361 is about 1242.6839542653.

The spelling of 1919031361 in words is "one billion, nine hundred nineteen million, thirty-one thousand, three hundred sixty-one".