1211365634 has 16 divisors (see below), whose sum is σ = 2025194400. Its totient is φ = 540051264.

The previous prime is 1211365627. The next prime is 1211365637. The reversal of 1211365634 is 4365631121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211365634.

It is not an unprimeable number, because it can be changed into a prime (1211365637) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 936944 + ... + 938235.

It is an arithmetic number, because the mean of its divisors is an integer number (126574650).

Almost surely, 2^1211365634 is an apocalyptic number.

1211365634 is a deficient number, since it is larger than the sum of its proper divisors (813828766).

1211365634 is a wasteful number, since it uses less digits than its factorization.

1211365634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875217.

The product of its digits is 12960, while the sum is 32.

The square root of 1211365634 is about 34804.6783349595. The cubic root of 1211365634 is about 1066.0029738250.

Adding to 1211365634 its reverse (4365631121), we get a palindrome (5576996755).

The spelling of 1211365634 in words is "one billion, two hundred eleven million, three hundred sixty-five thousand, six hundred thirty-four".