1001155205 has 8 divisors (see below), whose sum is σ = 1219317792. Its totient is φ = 788969808.

The previous prime is 1001155193. The next prime is 1001155223. The reversal of 1001155205 is 5025511001.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1001155205 - 2¹⁴ = 1001138821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1493927 + ... + 1494596.

It is an arithmetic number, because the mean of its divisors is an integer number (152414724).

Almost surely, 2^1001155205 is an apocalyptic number.

It is an amenable number.

1001155205 is a deficient number, since it is larger than the sum of its proper divisors (218162587).

1001155205 is an equidigital number, since it uses as much as digits as its factorization.

1001155205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2988595.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 1001155205 is about 31641.0367244817. The cubic root of 1001155205 is about 1000.3849201508.

Adding to 1001155205 its reverse (5025511001), we get a palindrome (6026666206).

The spelling of 1001155205 in words is "one billion, one million, one hundred fifty-five thousand, two hundred five".