1285517 has 2 divisors, whose sum is σ = 1285518. Its totient is φ = 1285516.

The previous prime is 1285513. The next prime is 1285519. The reversal of 1285517 is 7155821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 44521 = 1114^2 + 211^2 .

It is an emirp because it is prime and its reverse (7155821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285517 - 2² = 1285513 is a prime.

Together with 1285519, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1285517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642758 + 642759.

It is an arithmetic number, because the mean of its divisors is an integer number (642759).

2^1285517 is an apocalyptic number.

It is an amenable number.

1285517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285517 is an equidigital number, since it uses as much as digits as its factorization.

1285517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2800, while the sum is 29.

The square root of 1285517 is about 1133.8064208673. The cubic root of 1285517 is about 108.7324752666.

The spelling of 1285517 in words is "one million, two hundred eighty-five thousand, five hundred seventeen".