1281457 has 2 divisors, whose sum is σ = 1281458. Its totient is φ = 1281456.

The previous prime is 1281451. The next prime is 1281463. The reversal of 1281457 is 7541821.

It is a balanced prime because it is at equal distance from previous prime (1281451) and next prime (1281463).

It can be written as a sum of positive squares in only one way, i.e., 1168561 + 112896 = 1081^2 + 336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1281451) 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, 640728 + 640729.

It is an arithmetic number, because the mean of its divisors is an integer number (640729).

2^1281457 is an apocalyptic number.

It is an amenable number.

1281457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281457 is an equidigital number, since it uses as much as digits as its factorization.

1281457 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1281457 is about 1132.0145758779. The cubic root of 1281457 is about 108.6178859848.

The spelling of 1281457 in words is "one million, two hundred eighty-one thousand, four hundred fifty-seven".