1016891819 has 4 divisors (see below), whose sum is σ = 1021452096. Its totient is φ = 1012331544.

The previous prime is 1016891807. The next prime is 1016891861. The reversal of 1016891819 is 9181986101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9181986101 = 23 ⋅399216787.

It is a cyclic number.

It is not a de Polignac number, because 1016891819 - 2⁴ = 1016891803 is a prime.

It is a super-2 number, since 2×1016891819² = 2068137943098257522, 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 1016891819.

It is not an unprimeable number, because it can be changed into a prime (1016891719) 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, 2279804 + ... + 2280249.

It is an arithmetic number, because the mean of its divisors is an integer number (255363024).

Almost surely, 2^1016891819 is an apocalyptic number.

1016891819 is a deficient number, since it is larger than the sum of its proper divisors (4560277).

1016891819 is an equidigital number, since it uses as much as digits as its factorization.

1016891819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560276.

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

The square root of 1016891819 is about 31888.7412576916. The cubic root of 1016891819 is about 1005.5991968149.

The spelling of 1016891819 in words is "one billion, sixteen million, eight hundred ninety-one thousand, eight hundred nineteen".