1213826851 has 2 divisors, whose sum is σ = 1213826852. Its totient is φ = 1213826850.

The previous prime is 1213826827. The next prime is 1213826857. The reversal of 1213826851 is 1586283121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213826851 - 2⁵ = 1213826819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213826851.

It is not a weakly prime, because it can be changed into another prime (1213826857) 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 as a sum of consecutive naturals, namely, 606913425 + 606913426.

It is an arithmetic number, because the mean of its divisors is an integer number (606913426).

Almost surely, 2^1213826851 is an apocalyptic number.

1213826851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213826851 is an equidigital number, since it uses as much as digits as its factorization.

1213826851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 37.

The square root of 1213826851 is about 34840.0179534971. The cubic root of 1213826851 is about 1066.7244432355.

The spelling of 1213826851 in words is "one billion, two hundred thirteen million, eight hundred twenty-six thousand, eight hundred fifty-one".