1287617225 has 12 divisors (see below), whose sum is σ = 1598392860. Its totient is φ = 1028966400.

The previous prime is 1287617207. The next prime is 1287617231. The reversal of 1287617225 is 5227167821.

It can be written as a sum of positive squares in 6 ways, for example, as 287539849 + 1000077376 = 16957^2 + 31624^2 .

It is not a de Polignac number, because 1287617225 - 2¹⁸ = 1287355081 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4496 + ... + 50945.

It is an arithmetic number, because the mean of its divisors is an integer number (133199405).

Almost surely, 2^1287617225 is an apocalyptic number.

It is an amenable number.

1287617225 is a deficient number, since it is larger than the sum of its proper divisors (310775635).

1287617225 is an equidigital number, since it uses as much as digits as its factorization.

1287617225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56380 (or 56375 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 1287617225 is about 35883.3836893903. The cubic root of 1287617225 is about 1087.9165726944.

The spelling of 1287617225 in words is "one billion, two hundred eighty-seven million, six hundred seventeen thousand, two hundred twenty-five".