1005644149 has 4 divisors (see below), whose sum is σ = 1006858060. Its totient is φ = 1004430240.

The previous prime is 1005644119. The next prime is 1005644153. The reversal of 1005644149 is 9414465001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9414465001 = 67 ⋅140514403.

It can be written as a sum of positive squares in 2 ways, for example, as 746273124 + 259371025 = 27318^2 + 16105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005644149 - 2¹¹ = 1005642101 is a prime.

It is a super-2 number, since 2×1005644149² = 2022640308835868402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005644119) 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, 605712 + ... + 607369.

It is an arithmetic number, because the mean of its divisors is an integer number (251714515).

Almost surely, 2^1005644149 is an apocalyptic number.

It is an amenable number.

1005644149 is a deficient number, since it is larger than the sum of its proper divisors (1213911).

1005644149 is an equidigital number, since it uses as much as digits as its factorization.

1005644149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213910.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1005644149 is about 31711.8928637191. The cubic root of 1005644149 is about 1001.8778544553.

The spelling of 1005644149 in words is "one billion, five million, six hundred forty-four thousand, one hundred forty-nine".