1288541 has 2 divisors, whose sum is σ = 1288542. Its totient is φ = 1288540.

The previous prime is 1288531. The next prime is 1288543. The reversal of 1288541 is 1458821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1144900 + 143641 = 1070^2 + 379^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288541 - 2¹⁴ = 1272157 is a prime.

It is a Sophie Germain prime.

Together with 1288543, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1288543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644270 + 644271.

It is an arithmetic number, because the mean of its divisors is an integer number (644271).

2^1288541 is an apocalyptic number.

It is an amenable number.

1288541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288541 is an equidigital number, since it uses as much as digits as its factorization.

1288541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 29.

The square root of 1288541 is about 1135.1391985127. The cubic root of 1288541 is about 108.8176678434.

The spelling of 1288541 in words is "one million, two hundred eighty-eight thousand, five hundred forty-one".