1211042564 has 12 divisors (see below), whose sum is σ = 2125399500. Its totient is φ = 603785568.

The previous prime is 1211042537. The next prime is 1211042603. The reversal of 1211042564 is 4652401121.

It can be written as a sum of positive squares in 2 ways, for example, as 311522500 + 899520064 = 17650^2 + 29992^2 .

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 3 ways as a sum of consecutive naturals, for example, 432359 + ... + 435150.

It is an arithmetic number, because the mean of its divisors is an integer number (177116625).

Almost surely, 2^1211042564 is an apocalyptic number.

It is an amenable number.

1211042564 is a deficient number, since it is larger than the sum of its proper divisors (914356936).

1211042564 is a wasteful number, since it uses less digits than its factorization.

1211042564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867862 (or 867860 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1211042564 is about 34800.0368390610. The cubic root of 1211042564 is about 1065.9081980909.

Adding to 1211042564 its reverse (4652401121), we get a palindrome (5863443685).

The spelling of 1211042564 in words is "one billion, two hundred eleven million, forty-two thousand, five hundred sixty-four".