1281547 has 2 divisors, whose sum is σ = 1281548. Its totient is φ = 1281546.

The previous prime is 1281541. The next prime is 1281551. The reversal of 1281547 is 7451821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1281547 - 2¹⁹ = 757259 is a prime.

It is not a weakly prime, because it can be changed into another prime (1281541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640773 + 640774.

It is an arithmetic number, because the mean of its divisors is an integer number (640774).

2^1281547 is an apocalyptic number.

1281547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281547 is an equidigital number, since it uses as much as digits as its factorization.

1281547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 28.

The square root of 1281547 is about 1132.0543273183. The cubic root of 1281547 is about 108.6204287625.

The spelling of 1281547 in words is "one million, two hundred eighty-one thousand, five hundred forty-seven".