1005653221 has 4 divisors (see below), whose sum is σ = 1005720352. Its totient is φ = 1005586092.

The previous prime is 1005653203. The next prime is 1005653227. The reversal of 1005653221 is 1223565001.

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, 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 1005653221 - 2⁵ = 1005653189 is a prime.

It is a super-2 number, since 2×1005653221² = 2022676801815349682, 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 (1005653227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286 + ... + 44848.

It is an arithmetic number, because the mean of its divisors is an integer number (251430088).

Almost surely, 2^1005653221 is an apocalyptic number.

It is an amenable number.

1005653221 is a deficient number, since it is larger than the sum of its proper divisors (67131).

1005653221 is an equidigital number, since it uses as much as digits as its factorization.

1005653221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67130.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1005653221 is about 31712.0359012158. The cubic root of 1005653221 is about 1001.8808671209.

The spelling of 1005653221 in words is "one billion, five million, six hundred fifty-three thousand, two hundred twenty-one".