1081819619 has 4 divisors (see below), whose sum is σ = 1087425096. Its totient is φ = 1076214144.

The previous prime is 1081819603. The next prime is 1081819637. The reversal of 1081819619 is 9169181801.

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

It is a cyclic number.

It is not a de Polignac number, because 1081819619 - 2⁴ = 1081819603 is a prime.

It is a super-2 number, since 2×1081819619² = 2340667376106610322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1081819619.

It is not an unprimeable number, because it can be changed into a prime (1081819649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2802449 + ... + 2802834.

It is an arithmetic number, because the mean of its divisors is an integer number (271856274).

Almost surely, 2^1081819619 is an apocalyptic number.

1081819619 is a deficient number, since it is larger than the sum of its proper divisors (5605477).

1081819619 is an equidigital number, since it uses as much as digits as its factorization.

1081819619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5605476.

The product of its (nonzero) digits is 31104, while the sum is 44.

The square root of 1081819619 is about 32891.0264205908. The cubic root of 1081819619 is about 1026.5614492840.

The spelling of 1081819619 in words is "one billion, eighty-one million, eight hundred nineteen thousand, six hundred nineteen".