1288531 has 2 divisors, whose sum is σ = 1288532. Its totient is φ = 1288530.

The previous prime is 1288519. The next prime is 1288541. The reversal of 1288531 is 1358821.

It is a strong prime.

It is an emirp because it is prime and its reverse (1358821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1288531 is a prime.

It is a super-2 number, since 2×1288531² = 3320624275922, which contains 22 as substring.

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 1288531.

It is not a weakly prime, because it can be changed into another prime (1288541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644265 + 644266.

It is an arithmetic number, because the mean of its divisors is an integer number (644266).

2^1288531 is an apocalyptic number.

1288531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288531 is an equidigital number, since it uses as much as digits as its factorization.

1288531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 28.

The square root of 1288531 is about 1135.1347937580. The cubic root of 1288531 is about 108.8173863417.

The spelling of 1288531 in words is "one million, two hundred eighty-eight thousand, five hundred thirty-one".