1285626817 has 2 divisors, whose sum is σ = 1285626818. Its totient is φ = 1285626816.

The previous prime is 1285626799. The next prime is 1285626829. The reversal of 1285626817 is 7186265821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 953512641 + 332114176 = 30879^2 + 18224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285626817 - 2⁷ = 1285626689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1285623817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642813408 + 642813409.

It is an arithmetic number, because the mean of its divisors is an integer number (642813409).

Almost surely, 2^1285626817 is an apocalyptic number.

It is an amenable number.

1285626817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285626817 is an equidigital number, since it uses as much as digits as its factorization.

1285626817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The square root of 1285626817 is about 35855.6385663399. The cubic root of 1285626817 is about 1087.3557138384.

The spelling of 1285626817 in words is "one billion, two hundred eighty-five million, six hundred twenty-six thousand, eight hundred seventeen".