1286990825 has 6 divisors (see below), whose sum is σ = 1595868654. Its totient is φ = 1029592640.

The previous prime is 1286990813. The next prime is 1286990827. The reversal of 1286990825 is 5280996821.

1286990825 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 3345241 + 1283645584 = 1829^2 + 35828^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1286990825 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1286990827) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 25739792 + ... + 25739841.

It is an arithmetic number, because the mean of its divisors is an integer number (265978109).

Almost surely, 2^1286990825 is an apocalyptic number.

It is an amenable number.

1286990825 is a deficient number, since it is larger than the sum of its proper divisors (308877829).

1286990825 is an equidigital number, since it uses as much as digits as its factorization.

1286990825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51479643 (or 51479638 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 1286990825 is about 35874.6543537356. The cubic root of 1286990825 is about 1087.7401275353.

The spelling of 1286990825 in words is "one billion, two hundred eighty-six million, nine hundred ninety thousand, eight hundred twenty-five".