1223278025 has 6 divisors (see below), whose sum is σ = 1516864782. Its totient is φ = 978622400.

The previous prime is 1223278019. The next prime is 1223278031. The reversal of 1223278025 is 5208723221.

It is an interprime number because it is at equal distance from previous prime (1223278019) and next prime (1223278031).

It can be written as a sum of positive squares in 3 ways, for example, as 31854736 + 1191423289 = 5644^2 + 34517^2 .

It is not a de Polignac number, because 1223278025 - 2¹⁸ = 1223015881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1223277982 and 1223278000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24465536 + ... + 24465585.

It is an arithmetic number, because the mean of its divisors is an integer number (252810797).

Almost surely, 2^1223278025 is an apocalyptic number.

It is an amenable number.

1223278025 is a deficient number, since it is larger than the sum of its proper divisors (293586757).

1223278025 is an equidigital number, since it uses as much as digits as its factorization.

1223278025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48931131 (or 48931126 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 1223278025 is about 34975.3917061696. The cubic root of 1223278025 is about 1069.4858871792.

The spelling of 1223278025 in words is "one billion, two hundred twenty-three million, two hundred seventy-eight thousand, twenty-five".