1211200136 has 8 divisors (see below), whose sum is σ = 2271000270. Its totient is φ = 605600064.

The previous prime is 1211200121. The next prime is 1211200141. The reversal of 1211200136 is 6310021121.

It can be written as a sum of positive squares in only one way, i.e., 1122652036 + 88548100 = 33506^2 + 9410^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 75700001 + ... + 75700016.

Almost surely, 2^1211200136 is an apocalyptic number.

It is an amenable number.

1211200136 is a deficient number, since it is larger than the sum of its proper divisors (1059800134).

1211200136 is a wasteful number, since it uses less digits than its factorization.

1211200136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151400023 (or 151400019 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1211200136 is about 34802.3007285438. The cubic root of 1211200136 is about 1065.9544254787.

Adding to 1211200136 its reverse (6310021121), we get a palindrome (7521221257).

The spelling of 1211200136 in words is "one billion, two hundred eleven million, two hundred thousand, one hundred thirty-six".