1005505709 has 4 divisors (see below), whose sum is σ = 1082852316. Its totient is φ = 928159104.

The previous prime is 1005505687. The next prime is 1005505727. The reversal of 1005505709 is 9075055001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 659359684 + 346146025 = 25678^2 + 18605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005505709 - 2²⁴ = 988728493 is a prime.

It is a super-2 number, since 2×1005505709² = 2022083461663185362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005505729) 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, 38673284 + ... + 38673309.

It is an arithmetic number, because the mean of its divisors is an integer number (270713079).

Almost surely, 2^1005505709 is an apocalyptic number.

It is an amenable number.

1005505709 is a deficient number, since it is larger than the sum of its proper divisors (77346607).

1005505709 is an equidigital number, since it uses as much as digits as its factorization.

1005505709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77346606.

The product of its (nonzero) digits is 7875, while the sum is 32.

The square root of 1005505709 is about 31709.7100112883. The cubic root of 1005505709 is about 1001.8318785053.

The spelling of 1005505709 in words is "one billion, five million, five hundred five thousand, seven hundred nine".