1005606521 has 4 divisors (see below), whose sum is σ = 1058533200. Its totient is φ = 952679844.

The previous prime is 1005606493. The next prime is 1005606541. The reversal of 1005606521 is 1256065001.

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 an emirpimes, since its reverse is a distinct semiprime: 1256065001 = 34913 ⋅35977.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005606521 is a prime.

It is a super-2 number, since 2×1005606521² = 2022488950155446882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005606541) 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, 26463311 + ... + 26463348.

It is an arithmetic number, because the mean of its divisors is an integer number (264633300).

Almost surely, 2^1005606521 is an apocalyptic number.

It is an amenable number.

1005606521 is a deficient number, since it is larger than the sum of its proper divisors (52926679).

1005606521 is an equidigital number, since it uses as much as digits as its factorization.

1005606521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52926678.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1005606521 is about 31711.2995791721. The cubic root of 1005606521 is about 1001.8653586071.

The spelling of 1005606521 in words is "one billion, five million, six hundred six thousand, five hundred twenty-one".