1211540516 has 24 divisors (see below), whose sum is σ = 2135085624. Its totient is φ = 601528320.

The previous prime is 1211540509. The next prime is 1211540579. The reversal of 1211540516 is 6150451121.

It can be written as a sum of positive squares in 4 ways, for example, as 696432100 + 515108416 = 26390^2 + 22696^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564806 + ... + 566946.

It is an arithmetic number, because the mean of its divisors is an integer number (88961901).

Almost surely, 2^1211540516 is an apocalyptic number.

It is an amenable number.

1211540516 is a deficient number, since it is larger than the sum of its proper divisors (923545108).

1211540516 is a wasteful number, since it uses less digits than its factorization.

1211540516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3071 (or 3069 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1211540516 is about 34807.1905789594. The cubic root of 1211540516 is about 1066.0542701351.

Adding to 1211540516 its reverse (6150451121), we get a palindrome (7361991637).

The spelling of 1211540516 in words is "one billion, two hundred eleven million, five hundred forty thousand, five hundred sixteen".