1212311137 has 2 divisors, whose sum is σ = 1212311138. Its totient is φ = 1212311136.

The previous prime is 1212311119. The next prime is 1212311143. The reversal of 1212311137 is 7311132121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1208327121 + 3984016 = 34761^2 + 1996^2 .

It is an emirp because it is prime and its reverse (7311132121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212311137 - 2¹¹ = 1212309089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212311237) by changing a digit.

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, 606155568 + 606155569.

It is an arithmetic number, because the mean of its divisors is an integer number (606155569).

Almost surely, 2^1212311137 is an apocalyptic number.

It is an amenable number.

1212311137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212311137 is an equidigital number, since it uses as much as digits as its factorization.

1212311137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 22.

The square root of 1212311137 is about 34818.2586727137. The cubic root of 1212311137 is about 1066.2802495602.

Adding to 1212311137 its reverse (7311132121), we get a palindrome (8523443258).

The spelling of 1212311137 in words is "one billion, two hundred twelve million, three hundred eleven thousand, one hundred thirty-seven".