1212785311 has 2 divisors, whose sum is σ = 1212785312. Its totient is φ = 1212785310.

The previous prime is 1212785309. The next prime is 1212785381. The reversal of 1212785311 is 1135872121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212785311 - 2¹ = 1212785309 is a prime.

Together with 1212785309, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212785381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606392655 + 606392656.

It is an arithmetic number, because the mean of its divisors is an integer number (606392656).

Almost surely, 2^1212785311 is an apocalyptic number.

1212785311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212785311 is an equidigital number, since it uses as much as digits as its factorization.

1212785311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 31.

The square root of 1212785311 is about 34825.0672791884. The cubic root of 1212785311 is about 1066.4192503087.

The spelling of 1212785311 in words is "one billion, two hundred twelve million, seven hundred eighty-five thousand, three hundred eleven".