1212820775 has 6 divisors (see below), whose sum is σ = 1503897792. Its totient is φ = 970256600.

The previous prime is 1212820733. The next prime is 1212820799. The reversal of 1212820775 is 5770282121.

It is not a de Polignac number, because 1212820775 - 2⁸ = 1212820519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 24256391 + ... + 24256440.

It is an arithmetic number, because the mean of its divisors is an integer number (250649632).

Almost surely, 2^1212820775 is an apocalyptic number.

1212820775 is a deficient number, since it is larger than the sum of its proper divisors (291077017).

1212820775 is an equidigital number, since it uses as much as digits as its factorization.

1212820775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48512841 (or 48512836 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 1212820775 is about 34825.5764489262. The cubic root of 1212820775 is about 1066.4296448727.

The spelling of 1212820775 in words is "one billion, two hundred twelve million, eight hundred twenty thousand, seven hundred seventy-five".