1145005221 has 4 divisors (see below), whose sum is σ = 1526673632. Its totient is φ = 763336812.

The previous prime is 1145005207. The next prime is 1145005241. The reversal of 1145005221 is 1225005411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1145005221 - 2¹¹ = 1145003173 is a prime.

It is a super-2 number, since 2×1145005221² = 2622073912234517682, 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 (1145005201) 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, 190834201 + ... + 190834206.

It is an arithmetic number, because the mean of its divisors is an integer number (381668408).

Almost surely, 2^1145005221 is an apocalyptic number.

It is an amenable number.

1145005221 is a deficient number, since it is larger than the sum of its proper divisors (381668411).

1145005221 is an equidigital number, since it uses as much as digits as its factorization.

1145005221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381668410.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1145005221 is about 33837.9257786289. The cubic root of 1145005221 is about 1046.1705467314.

The spelling of 1145005221 in words is "one billion, one hundred forty-five million, five thousand, two hundred twenty-one".