1211452005 has 32 divisors (see below), whose sum is σ = 1986042240. Its totient is φ = 630339840.

The previous prime is 1211451979. The next prime is 1211452019. The reversal of 1211452005 is 5002541121.

It is not a de Polignac number, because 1211452005 - 2⁸ = 1211451749 is a prime.

It is a super-3 number, since 3×1211452005³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139686 + ... + 148104.

It is an arithmetic number, because the mean of its divisors is an integer number (62063820).

Almost surely, 2^1211452005 is an apocalyptic number.

1211452005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211452005 is a deficient number, since it is larger than the sum of its proper divisors (774590235).

1211452005 is a wasteful number, since it uses less digits than its factorization.

1211452005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8661.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1211452005 is about 34805.9191086804. The cubic root of 1211452005 is about 1066.0283087451.

Adding to 1211452005 its reverse (5002541121), we get a palindrome (6213993126).

The spelling of 1211452005 in words is "one billion, two hundred eleven million, four hundred fifty-two thousand, five".