1225863281 has 2 divisors, whose sum is σ = 1225863282. Its totient is φ = 1225863280.

The previous prime is 1225863277. The next prime is 1225863329. The reversal of 1225863281 is 1823685221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 726787681 + 499075600 = 26959^2 + 22340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225863281 - 2² = 1225863277 is a prime.

It is a super-2 number, since 2×1225863281² = 3005481567408169922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1225863241) 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 as a sum of consecutive naturals, namely, 612931640 + 612931641.

It is an arithmetic number, because the mean of its divisors is an integer number (612931641).

Almost surely, 2^1225863281 is an apocalyptic number.

It is an amenable number.

1225863281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225863281 is an equidigital number, since it uses as much as digits as its factorization.

1225863281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 38.

The square root of 1225863281 is about 35012.3304137271. The cubic root of 1225863281 is about 1070.2387684465.

The spelling of 1225863281 in words is "one billion, two hundred twenty-five million, eight hundred sixty-three thousand, two hundred eighty-one".