1212136511 has 2 divisors, whose sum is σ = 1212136512. Its totient is φ = 1212136510.

The previous prime is 1212136507. The next prime is 1212136529. The reversal of 1212136511 is 1156312121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212136511 - 2² = 1212136507 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212136561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606068255 + 606068256.

It is an arithmetic number, because the mean of its divisors is an integer number (606068256).

Almost surely, 2^1212136511 is an apocalyptic number.

1212136511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212136511 is an equidigital number, since it uses as much as digits as its factorization.

1212136511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 1212136511 is about 34815.7509038653. The cubic root of 1212136511 is about 1066.2290500537.

Adding to 1212136511 its reverse (1156312121), we get a palindrome (2368448632).

The spelling of 1212136511 in words is "one billion, two hundred twelve million, one hundred thirty-six thousand, five hundred eleven".