1001211205 has 8 divisors (see below), whose sum is σ = 1213840152. Its totient is φ = 792711168.

The previous prime is 1001211203. The next prime is 1001211221. The reversal of 1001211205 is 5021121001.

It can be written as a sum of positive squares in 4 ways, for example, as 182736324 + 818474881 = 13518^2 + 28609^2 .

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 1001211205 - 2¹ = 1001211203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001211203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031692 + ... + 1032661.

It is an arithmetic number, because the mean of its divisors is an integer number (151730019).

Almost surely, 2^1001211205 is an apocalyptic number.

It is an amenable number.

1001211205 is a deficient number, since it is larger than the sum of its proper divisors (212628947).

1001211205 is an equidigital number, since it uses as much as digits as its factorization.

1001211205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064455.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1001211205 is about 31641.9216388638. The cubic root of 1001211205 is about 1000.4035721076.

Adding to 1001211205 its reverse (5021121001), we get a palindrome (6022332206).

The spelling of 1001211205 in words is "one billion, one million, two hundred eleven thousand, two hundred five".