1285511 has 2 divisors, whose sum is σ = 1285512. Its totient is φ = 1285510.

The previous prime is 1285507. The next prime is 1285513. The reversal of 1285511 is 1155821.

It is a strong prime.

It is an emirp because it is prime and its reverse (1155821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285511 - 2² = 1285507 is a prime.

It is a super-2 number, since 2×1285511² = 3305077062242, which contains 22 as substring.

Together with 1285513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642755 + 642756.

It is an arithmetic number, because the mean of its divisors is an integer number (642756).

2^1285511 is an apocalyptic number.

1285511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285511 is an equidigital number, since it uses as much as digits as its factorization.

1285511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 23.

The square root of 1285511 is about 1133.8037749099. The cubic root of 1285511 is about 108.7323061009.

The spelling of 1285511 in words is "one million, two hundred eighty-five thousand, five hundred eleven".