1005649919 has 4 divisors (see below), whose sum is σ = 1005721944. Its totient is φ = 1005577896.

The previous prime is 1005649913. The next prime is 1005649921. The reversal of 1005649919 is 9199465001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1005649919 - 2⁴ = 1005649903 is a prime.

It is a super-2 number, since 2×1005649919² = 2022663519169413122, 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 1005649919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005649913) 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, 7592 + ... + 45485.

It is an arithmetic number, because the mean of its divisors is an integer number (251430486).

Almost surely, 2^1005649919 is an apocalyptic number.

1005649919 is a deficient number, since it is larger than the sum of its proper divisors (72025).

1005649919 is an equidigital number, since it uses as much as digits as its factorization.

1005649919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72024.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 1005649919 is about 31711.9838389212. The cubic root of 1005649919 is about 1001.8797705818.

The spelling of 1005649919 in words is "one billion, five million, six hundred forty-nine thousand, nine hundred nineteen".