1011605 has 12 divisors (see below), whose sum is σ = 1412460. Its totient is φ = 693504.

The previous prime is 1011601. The next prime is 1011631. The reversal of 1011605 is 5061101.

It can be written as a sum of positive squares in 2 ways, for example, as 461041 + 550564 = 679^2 + 742^2 .

It is not a de Polignac number, because 1011605 - 2² = 1011601 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1820 + ... + 2309.

It is an arithmetic number, because the mean of its divisors is an integer number (117705).

2^1011605 is an apocalyptic number.

It is an amenable number.

1011605 is a deficient number, since it is larger than the sum of its proper divisors (400855).

1011605 is an equidigital number, since it uses as much as digits as its factorization.

1011605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148 (or 4141 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 1011605 is about 1005.7857624763. The cubic root of 1011605 is about 100.3853465067.

Adding to 1011605 its reverse (5061101), we get a palindrome (6072706).

The spelling of 1011605 in words is "one million, eleven thousand, six hundred five".