1211015005 has 16 divisors (see below), whose sum is σ = 1480070448. Its totient is φ = 950976000.

The previous prime is 1211014999. The next prime is 1211015041. The reversal of 1211015005 is 5005101121.

It can be written as a sum of positive squares in 8 ways, for example, as 81920601 + 1129094404 = 9051^2 + 33602^2 .

It is not a de Polignac number, because 1211015005 - 2¹⁹ = 1210490717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211015005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155095 + ... + 162715.

It is an arithmetic number, because the mean of its divisors is an integer number (92504403).

Almost surely, 2^1211015005 is an apocalyptic number.

It is an amenable number.

1211015005 is a deficient number, since it is larger than the sum of its proper divisors (269055443).

1211015005 is an equidigital number, since it uses as much as digits as its factorization.

1211015005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8208.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 1211015005 is about 34799.6408745837. The cubic root of 1211015005 is about 1065.9001126094.

Adding to 1211015005 its reverse (5005101121), we get a palindrome (6216116126).

The spelling of 1211015005 in words is "one billion, two hundred eleven million, fifteen thousand, five".