1005325661 has 4 divisors (see below), whose sum is σ = 1009237692. Its totient is φ = 1001413632.

The previous prime is 1005325649. The next prime is 1005325667. The reversal of 1005325661 is 1665235001.

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 987844900 + 17480761 = 31430^2 + 4181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005325661 - 2²² = 1001131357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005325667) 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, 1955630 + ... + 1956143.

It is an arithmetic number, because the mean of its divisors is an integer number (252309423).

Almost surely, 2^1005325661 is an apocalyptic number.

It is an amenable number.

1005325661 is a deficient number, since it is larger than the sum of its proper divisors (3912031).

1005325661 is an equidigital number, since it uses as much as digits as its factorization.

1005325661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912030.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1005325661 is about 31706.8708799844. The cubic root of 1005325661 is about 1001.7720782172.

The spelling of 1005325661 in words is "one billion, five million, three hundred twenty-five thousand, six hundred sixty-one".