1211042536 has 48 divisors (see below), whose sum is σ = 2515806720. Its totient is φ = 546084000.

The previous prime is 1211042533. The next prime is 1211042537. The reversal of 1211042536 is 6352401121.

It is a happy number.

It is a super-2 number, since 2×1211042536² = 2933248048002622592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211042536.

It is not an unprimeable number, because it can be changed into a prime (1211042531) 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 11 ways as a sum of consecutive naturals, for example, 118011 + ... + 127861.

It is an arithmetic number, because the mean of its divisors is an integer number (52412640).

Almost surely, 2^1211042536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211042536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1257903360).

1211042536 is an abundant number, since it is smaller than the sum of its proper divisors (1304764184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211042536 is a wasteful number, since it uses less digits than its factorization.

1211042536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10006 (or 9991 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1211042536 is about 34800.0364367625. The cubic root of 1211042536 is about 1065.9081898761.

Adding to 1211042536 its reverse (6352401121), we get a palindrome (7563443657).

The spelling of 1211042536 in words is "one billion, two hundred eleven million, forty-two thousand, five hundred thirty-six".