1213387273 has 4 divisors (see below), whose sum is σ = 1386728320. Its totient is φ = 1040046228.

The previous prime is 1213387267. The next prime is 1213387309. The reversal of 1213387273 is 3727833121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3727833121 = 9929 ⋅375449.

It is a cyclic number.

It is not a de Polignac number, because 1213387273 - 2⁹ = 1213386761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213388273) 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 in 3 ways as a sum of consecutive naturals, for example, 86670513 + ... + 86670526.

It is an arithmetic number, because the mean of its divisors is an integer number (346682080).

Almost surely, 2^1213387273 is an apocalyptic number.

It is an amenable number.

1213387273 is a deficient number, since it is larger than the sum of its proper divisors (173341047).

1213387273 is an equidigital number, since it uses as much as digits as its factorization.

1213387273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173341046.

The product of its digits is 42336, while the sum is 37.

The square root of 1213387273 is about 34833.7088608147. The cubic root of 1213387273 is about 1066.5956590210.

The spelling of 1213387273 in words is "one billion, two hundred thirteen million, three hundred eighty-seven thousand, two hundred seventy-three".