1286261 has 2 divisors, whose sum is σ = 1286262. Its totient is φ = 1286260.

The previous prime is 1286239. The next prime is 1286267. The reversal of 1286261 is 1626821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1030225 + 256036 = 1015^2 + 506^2 .

It is a cyclic number.

It is not a de Polignac number, because 1286261 - 2¹⁰ = 1285237 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1286261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1286267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643130 + 643131.

It is an arithmetic number, because the mean of its divisors is an integer number (643131).

2^1286261 is an apocalyptic number.

It is an amenable number.

1286261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286261 is an equidigital number, since it uses as much as digits as its factorization.

1286261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 1286261 is about 1134.1344717449. The cubic root of 1286261 is about 108.7534477262.

The spelling of 1286261 in words is "one million, two hundred eighty-six thousand, two hundred sixty-one".